

<!-- RR Donnelley Xcelerate Instance Document, based on XBRL 2.1  http://www.rrdonnelley.com/ -->
<!-- Version:  6.22.4 -->
<!-- Round: 7 -->
<!-- Creation date: 2016-05-09T19:01:35Z -->
<!-- Copyright (c) 2005-2013 R.R. Donnelley & Sons Company All Rights Reserved. -->
<xbrl xmlns="http://www.xbrl.org/2003/instance" xmlns:xbrll="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:iso4217="http://www.xbrl.org/2003/iso4217" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:us-gaap="http://fasb.org/us-gaap/2015-01-31" xmlns:dei="http://xbrl.sec.gov/dei/2014-01-31" xmlns:ardx="http://www.ardelyx.com/20160331" xmlns:us-types="http://fasb.org/us-types/2015-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:stpr="http://xbrl.sec.gov/stpr/2011-01-31" xmlns:country="http://xbrl.sec.gov/country/2013-01-31" xmlns:currency="http://xbrl.sec.gov/currency/2014-01-31" xmlns:exch="http://xbrl.sec.gov/exch/2015-01-31" xmlns:naics="http://xbrl.sec.gov/naics/2011-01-31" xmlns:invest="http://xbrl.sec.gov/invest/2013-01-31" xmlns:sic="http://xbrl.sec.gov/sic/2011-01-31" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:utr="http://www.xbrl.org/2009/utr">
  <xbrll:schemaRef xlink:type="simple" xlink:arcrole="http://www.xbrl.org/2003/linkbase" xlink:href="ardx-20160331.xsd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrll="http://www.xbrl.org/2003/linkbase" />
  <us-gaap:SharesIssuedPricePerShare contextRef="eol_PE780538--1610-Q0002_STD_0_20160131_0" unitRef="iso4217_USD_per_shares" decimals="INF" id="id_9429491_833366DF-B1DA-4965-9A07-D64B44632B00_1001_2">10.00</us-gaap:SharesIssuedPricePerShare>
  <us-gaap:CapitalLeasesFutureMinimumPaymentsDue contextRef="eol_PE780538--1610-Q0002_STD_0_20160430_0_1636141x1633766_1639226x2015016" unitRef="iso4217_USD" decimals="-5" id="id_9429491_658267C1-927D-42B4-9C0A-2CAB9CFF937C_2001_2">5800000</us-gaap:CapitalLeasesFutureMinimumPaymentsDue>
  <dei:EntityCommonStockSharesOutstanding contextRef="eol_PE780538--1610-Q0002_STD_0_20160505_0" unitRef="shares" decimals="INF" id="id_9429491_4FC6BF1F-0EEB-4896-9092-41C56452EE88_2_500005">34630148</dei:EntityCommonStockSharesOutstanding>
  <us-gaap:SharesIssuedPricePerShare contextRef="eol_PE780538--1610-Q0002_STD_0_20160229_0_1639657x1944181" unitRef="iso4217_USD_per_shares" decimals="INF" id="id_9429491_10D75B26-1A98-4F77-94A7-4C56BCB58963_2001_1">8.21</us-gaap:SharesIssuedPricePerShare>
  <us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 contextRef="eol_PE780538--1610-Q0002_STD_0_20150630_0" unitRef="iso4217_USD_per_shares" decimals="INF" id="id_9429491_060E3F46-D6F2-40A1-BAB2-BB601679B4F5_1001_5">0.125</us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1>
  <us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights contextRef="eol_PE780538--1610-Q0002_STD_0_20150630_0" unitRef="shares" decimals="INF" id="id_9429491_060E3F46-D6F2-40A1-BAB2-BB601679B4F5_1001_4">2172899</us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights>
  <us-gaap:SharesIssuedPricePerShare contextRef="eol_PE780538--1610-Q0002_STD_0_20150630_0" unitRef="iso4217_USD_per_shares" decimals="INF" id="id_9429491_060E3F46-D6F2-40A1-BAB2-BB601679B4F5_1001_3">10.70</us-gaap:SharesIssuedPricePerShare>
  <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="eol_PE780538--1610-Q0002_STD_0_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1002_25">98318000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
  <us-gaap:CommonStockSharesAuthorized contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_26">300000000</us-gaap:CommonStockSharesAuthorized>
  <us-gaap:PreferredStockSharesOutstanding contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_23">0</us-gaap:PreferredStockSharesOutstanding>
  <us-gaap:CommonStockSharesOutstanding contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_28">34630148</us-gaap:CommonStockSharesOutstanding>
  <us-gaap:CommonStockParOrStatedValuePerShare contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD_per_shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_25">0.0001</us-gaap:CommonStockParOrStatedValuePerShare>
  <us-gaap:PreferredStockSharesAuthorized contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_21">5000000</us-gaap:PreferredStockSharesAuthorized>
  <us-gaap:PreferredStockSharesIssued contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_22">0</us-gaap:PreferredStockSharesIssued>
  <us-gaap:CommonStockSharesIssued contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_27">34630148</us-gaap:CommonStockSharesIssued>
  <us-gaap:PreferredStockParOrStatedValuePerShare contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD_per_shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_20">0.0001</us-gaap:PreferredStockParOrStatedValuePerShare>
  <us-gaap:AdditionalPaidInCapitalCommonStock contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_29">292699000</us-gaap:AdditionalPaidInCapitalCommonStock>
  <us-gaap:AccruedLiabilitiesAndOtherLiabilities contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_13">6265000</us-gaap:AccruedLiabilitiesAndOtherLiabilities>
  <us-gaap:EmployeeRelatedLiabilitiesCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_12">1318000</us-gaap:EmployeeRelatedLiabilitiesCurrent>
  <us-gaap:StockholdersEquity contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_31">167748000</us-gaap:StockholdersEquity>
  <us-gaap:OtherLiabilitiesNoncurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_15">292000</us-gaap:OtherLiabilitiesNoncurrent>
  <us-gaap:FairValueAssetsLevel1ToLevel2TransfersAmount contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="INF" id="id_9429491_48F451C4-1A7D-4122-AEF5-F8E81391C0DB_1001_0">0</us-gaap:FairValueAssetsLevel1ToLevel2TransfersAmount>
  <us-gaap:FairValueAssetsLevel2ToLevel1TransfersAmount contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="INF" id="id_9429491_48F451C4-1A7D-4122-AEF5-F8E81391C0DB_1001_1">0</us-gaap:FairValueAssetsLevel2ToLevel1TransfersAmount>
  <us-gaap:OtherLiabilitiesCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_9394BF67-A5CC-4FEA-B70C-89AC85C05B34_1001_4">539000</us-gaap:OtherLiabilitiesCurrent>
  <us-gaap:AccountsPayableCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_11">4875000</us-gaap:AccountsPayableCurrent>
  <us-gaap:RetainedEarningsAccumulatedDeficit contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_30">-124955000</us-gaap:RetainedEarningsAccumulatedDeficit>
  <us-gaap:Liabilities contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_16">12750000</us-gaap:Liabilities>
  <us-gaap:LiabilitiesAndStockholdersEquity contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_32">180498000</us-gaap:LiabilitiesAndStockholdersEquity>
  <us-gaap:CommonStockValue contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_24">4000</us-gaap:CommonStockValue>
  <us-gaap:CommitmentsAndContingencies contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" xsi:nil="true" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_17" />
  <us-gaap:LiabilitiesCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_14">12458000</us-gaap:LiabilitiesCurrent>
  <us-gaap:PreferredStockValue contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" xsi:nil="true" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_19" />
  <us-gaap:OtherAssetsNoncurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_6">104000</us-gaap:OtherAssetsNoncurrent>
  <us-gaap:Assets contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_8">180498000</us-gaap:Assets>
  <us-gaap:PropertyPlantAndEquipmentNet contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_5">4597000</us-gaap:PropertyPlantAndEquipmentNet>
  <us-gaap:RestrictedCashAndCashEquivalentsNoncurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_7">100000</us-gaap:RestrictedCashAndCashEquivalentsNoncurrent>
  <us-gaap:AssetsCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_4">175697000</us-gaap:AssetsCurrent>
  <us-gaap:PrepaidExpenseAndOtherAssetsCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_3">4019000</us-gaap:PrepaidExpenseAndOtherAssetsCurrent>
  <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_1_2">171678000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
  <ardx:AccruedClinicalTrialExpenses contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_9394BF67-A5CC-4FEA-B70C-89AC85C05B34_1001_0">2740000</ardx:AccruedClinicalTrialExpenses>
  <ardx:AccruedContractManufacturingCosts contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_9394BF67-A5CC-4FEA-B70C-89AC85C05B34_1001_1">662000</ardx:AccruedContractManufacturingCosts>
  <ardx:AccruedProfessionalAndConsultantFeesCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_9394BF67-A5CC-4FEA-B70C-89AC85C05B34_1001_2">324000</ardx:AccruedProfessionalAndConsultantFeesCurrent>
  <us-gaap:AccruedLiabilitiesCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0_1631490x1776822" unitRef="iso4217_USD" decimals="-6" id="id_9429491_CA67A722-A705-4117-B012-5C9CAB8D4B2A_3003_4">2000000</us-gaap:AccruedLiabilitiesCurrent>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0_1634760x1637150_1637541x1640681_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_1E766A2D-4929-4FD5-ABEA-A84B7B41EDCB_4003_3">100000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0_1634760x1637150_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_1E766A2D-4929-4FD5-ABEA-A84B7B41EDCB_1003_4">100000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0_1634760x1643241_1637541x1637231_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_1E766A2D-4929-4FD5-ABEA-A84B7B41EDCB_3002_2">170635000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0_1634760x1643241_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_1E766A2D-4929-4FD5-ABEA-A84B7B41EDCB_1002_4">170635000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0_1637541x1637231_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_1E766A2D-4929-4FD5-ABEA-A84B7B41EDCB_3001_2">170635000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0_1637541x1640681_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_1E766A2D-4929-4FD5-ABEA-A84B7B41EDCB_4001_3">100000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0_1642755x1633925" unitRef="iso4217_USD" decimals="-5" id="id_9429491_7099E236-C635-4F47-B96C-B9C2FBCA11E6_1001_0">12700000</us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized>
  <us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0_1642755x1637723" unitRef="iso4217_USD" decimals="-5" id="id_9429491_7099E236-C635-4F47-B96C-B9C2FBCA11E6_1002_0">1000000</us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized>
  <us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0_1642755x1974116" unitRef="iso4217_USD" decimals="-5" id="id_9429491_7099E236-C635-4F47-B96C-B9C2FBCA11E6_1003_0">100000</us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20160331_0_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_1E766A2D-4929-4FD5-ABEA-A84B7B41EDCB_1001_4">170735000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="eol_PE780538--1610-Q0002_STD_0_20141231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2001_24">107286000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
  <us-gaap:CommonStockSharesAuthorized contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_26">300000000</us-gaap:CommonStockSharesAuthorized>
  <us-gaap:PreferredStockSharesOutstanding contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_23">0</us-gaap:PreferredStockSharesOutstanding>
  <us-gaap:CommonStockSharesOutstanding contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_28">25964886</us-gaap:CommonStockSharesOutstanding>
  <us-gaap:CommonStockParOrStatedValuePerShare contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD_per_shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_25">0.0001</us-gaap:CommonStockParOrStatedValuePerShare>
  <us-gaap:PreferredStockSharesAuthorized contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_21">5000000</us-gaap:PreferredStockSharesAuthorized>
  <us-gaap:PreferredStockSharesIssued contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_22">0</us-gaap:PreferredStockSharesIssued>
  <us-gaap:CommonStockSharesIssued contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_27">25964886</us-gaap:CommonStockSharesIssued>
  <us-gaap:PreferredStockParOrStatedValuePerShare contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD_per_shares" decimals="INF" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_20">0.0001</us-gaap:PreferredStockParOrStatedValuePerShare>
  <us-gaap:AdditionalPaidInCapitalCommonStock contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_29">210386000</us-gaap:AdditionalPaidInCapitalCommonStock>
  <us-gaap:AccruedLiabilitiesAndOtherLiabilities contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_13">2580000</us-gaap:AccruedLiabilitiesAndOtherLiabilities>
  <us-gaap:EmployeeRelatedLiabilitiesCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_12">2366000</us-gaap:EmployeeRelatedLiabilitiesCurrent>
  <us-gaap:StockholdersEquity contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_31">108901000</us-gaap:StockholdersEquity>
  <us-gaap:OtherLiabilitiesNoncurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_15">322000</us-gaap:OtherLiabilitiesNoncurrent>
  <us-gaap:OtherLiabilitiesCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_9394BF67-A5CC-4FEA-B70C-89AC85C05B34_1002_4">380000</us-gaap:OtherLiabilitiesCurrent>
  <us-gaap:AccountsPayableCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_11">2777000</us-gaap:AccountsPayableCurrent>
  <us-gaap:RetainedEarningsAccumulatedDeficit contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_30">-101488000</us-gaap:RetainedEarningsAccumulatedDeficit>
  <us-gaap:Liabilities contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_16">8045000</us-gaap:Liabilities>
  <us-gaap:LiabilitiesAndStockholdersEquity contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_32">116946000</us-gaap:LiabilitiesAndStockholdersEquity>
  <us-gaap:CommonStockValue contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_24">3000</us-gaap:CommonStockValue>
  <us-gaap:CommitmentsAndContingencies contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" xsi:nil="true" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_17" />
  <us-gaap:LiabilitiesCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_14">7723000</us-gaap:LiabilitiesCurrent>
  <us-gaap:PreferredStockValue contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" xsi:nil="true" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_19" />
  <us-gaap:OtherAssetsNoncurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_6">104000</us-gaap:OtherAssetsNoncurrent>
  <us-gaap:Assets contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_8">116946000</us-gaap:Assets>
  <us-gaap:PropertyPlantAndEquipmentNet contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_5">4711000</us-gaap:PropertyPlantAndEquipmentNet>
  <us-gaap:RestrictedCashAndCashEquivalentsNoncurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_7">100000</us-gaap:RestrictedCashAndCashEquivalentsNoncurrent>
  <us-gaap:AssetsCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_4">112031000</us-gaap:AssetsCurrent>
  <us-gaap:PrepaidExpenseAndOtherAssetsCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_3">5027000</us-gaap:PrepaidExpenseAndOtherAssetsCurrent>
  <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_A5B55075-EA0B-4B8F-BA0D-A68185B8DF8E_2_2">107004000</us-gaap:CashAndCashEquivalentsAtCarryingValue>
  <ardx:AccruedClinicalTrialExpenses contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_9394BF67-A5CC-4FEA-B70C-89AC85C05B34_1002_0">311000</ardx:AccruedClinicalTrialExpenses>
  <ardx:AccruedContractManufacturingCosts contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_9394BF67-A5CC-4FEA-B70C-89AC85C05B34_1002_1">289000</ardx:AccruedContractManufacturingCosts>
  <ardx:AccruedProfessionalAndConsultantFeesCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_9394BF67-A5CC-4FEA-B70C-89AC85C05B34_1002_2">272000</ardx:AccruedProfessionalAndConsultantFeesCurrent>
  <us-gaap:AccruedLiabilitiesCurrent contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0_1631490x1776822" unitRef="iso4217_USD" decimals="-3" id="id_9429491_9394BF67-A5CC-4FEA-B70C-89AC85C05B34_2002_3">1328000</us-gaap:AccruedLiabilitiesCurrent>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0_1634760x1637150_1637541x1640681_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_7E7A8D4B-1A63-462C-9EC7-09F4B85CE933_4003_3">100000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0_1634760x1637150_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_7E7A8D4B-1A63-462C-9EC7-09F4B85CE933_1003_4">100000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0_1634760x1643241_1637541x1637231_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_7E7A8D4B-1A63-462C-9EC7-09F4B85CE933_3002_2">105819000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0_1634760x1643241_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_7E7A8D4B-1A63-462C-9EC7-09F4B85CE933_1002_4">105819000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0_1637541x1637231_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_7E7A8D4B-1A63-462C-9EC7-09F4B85CE933_3001_2">105819000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0_1637541x1640681_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_7E7A8D4B-1A63-462C-9EC7-09F4B85CE933_4001_3">100000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:AssetsFairValueDisclosure contextRef="eol_PE780538--1610-Q0002_STD_0_20151231_0_1643666x1641611" unitRef="iso4217_USD" decimals="-3" id="id_9429491_7E7A8D4B-1A63-462C-9EC7-09F4B85CE933_1001_4">105919000</us-gaap:AssetsFairValueDisclosure>
  <us-gaap:LeaseExpirationDate1 contextRef="eol_PE780538--1610-Q0002_STD_1_20160430_0_1636141x1633766_1639226x2015016" id="id_9429491_658267C1-927D-42B4-9C0A-2CAB9CFF937C_1001_1">2021-09-30</us-gaap:LeaseExpirationDate1>
  <ardx:AllowanceForLeaseImprovement contextRef="eol_PE780538--1610-Q0002_STD_1_20160430_0_1636141x1633766_1639226x2015016" unitRef="iso4217_USD" decimals="INF" id="id_9429491_658267C1-927D-42B4-9C0A-2CAB9CFF937C_1001_0">400000</ardx:AllowanceForLeaseImprovement>
  <us-gaap:RevenueRecognitionMultipleDeliverableArrangementsDeterminationOfSellingPriceAmount contextRef="eol_PE780538--1610-Q0002_STD_21_20151130_0_1631490x1776822_1639304x1633605" unitRef="iso4217_USD" decimals="INF" id="id_9429491_CA67A722-A705-4117-B012-5C9CAB8D4B2A_2002_1">8000000</us-gaap:RevenueRecognitionMultipleDeliverableArrangementsDeterminationOfSellingPriceAmount>
  <us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans contextRef="eol_PE780538--1610-Q0002_STD_29_20160229_0_1639657x1944181" unitRef="shares" decimals="INF" id="id_9429491_10D75B26-1A98-4F77-94A7-4C56BCB58963_1001_0">34012</us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans>
  <us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans contextRef="eol_PE780538--1610-Q0002_STD_29_20160229_0_1639657x1944181" unitRef="iso4217_USD" decimals="-5" id="id_9429491_10D75B26-1A98-4F77-94A7-4C56BCB58963_1001_2">300000</us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans>
  <us-gaap:StockIssuedDuringPeriodSharesNewIssues contextRef="eol_PE780538--1610-Q0002_STD_30_20150630_0" unitRef="shares" decimals="INF" id="id_9429491_060E3F46-D6F2-40A1-BAB2-BB601679B4F5_1_2">7242992</us-gaap:StockIssuedDuringPeriodSharesNewIssues>
  <invest:InvestmentWarrantsExercisePrice contextRef="eol_PE780538--1610-Q0002_STD_30_20150630_0" unitRef="iso4217_USD_per_shares" decimals="INF" id="id_9429491_060E3F46-D6F2-40A1-BAB2-BB601679B4F5_1_6">13.91</invest:InvestmentWarrantsExercisePrice>
  <us-gaap:ProceedsFromIssuanceOfCommonStock contextRef="eol_PE780538--1610-Q0002_STD_30_20150630_0" unitRef="iso4217_USD" decimals="-5" id="id_9429491_060E3F46-D6F2-40A1-BAB2-BB601679B4F5_1_1">74300000</us-gaap:ProceedsFromIssuanceOfCommonStock>
  <ardx:GrossProceedsFromIssuanceOfCommonStock contextRef="eol_PE780538--1610-Q0002_STD_30_20150630_0" unitRef="iso4217_USD" decimals="-5" id="id_9429491_060E3F46-D6F2-40A1-BAB2-BB601679B4F5_1_0">77800000</ardx:GrossProceedsFromIssuanceOfCommonStock>
  <ardx:WarrantExpirationTerm contextRef="eol_PE780538--1610-Q0002_STD_30_20150630_0" id="id_9429491_060E3F46-D6F2-40A1-BAB2-BB601679B4F5_1_7">P5Y</ardx:WarrantExpirationTerm>
  <ardx:ClassOfWarrantOrRightThresholdOwnershipPercentage contextRef="eol_PE780538--1610-Q0002_STD_30_20150630_0" unitRef="pure" decimals="INF" id="id_9429491_0B729B2E-5F94-4E1F-B7E3-42E9E93C557C_1_0">0.0999</ardx:ClassOfWarrantOrRightThresholdOwnershipPercentage>
  <us-gaap:RevenueRecognitionMultipleDeliverableArrangementsDeterminationOfSellingPriceAmount contextRef="eol_PE780538--1610-Q0002_STD_30_20150630_0_1631490x1776822_1639304x1633605" unitRef="iso4217_USD" decimals="INF" id="id_9429491_CA67A722-A705-4117-B012-5C9CAB8D4B2A_2001_0">10000000</us-gaap:RevenueRecognitionMultipleDeliverableArrangementsDeterminationOfSellingPriceAmount>
  <us-gaap:ProceedsFromLicenseFeesReceived contextRef="eol_PE780538--1610-Q0002_STD_31_20121031_0_1631490x1776822" unitRef="iso4217_USD" decimals="-5" id="id_9429491_A9F16076-F694-41BF-BA5F-F1CA87F72D56_1001_0">75000000</us-gaap:ProceedsFromLicenseFeesReceived>
  <us-gaap:StockIssuedDuringPeriodSharesNewIssues contextRef="eol_PE780538--1610-Q0002_STD_31_20160131_0" unitRef="shares" decimals="INF" id="id_9429491_833366DF-B1DA-4965-9A07-D64B44632B00_1_0">8625000</us-gaap:StockIssuedDuringPeriodSharesNewIssues>
  <us-gaap:ProceedsFromIssuanceOfCommonStock contextRef="eol_PE780538--1610-Q0002_STD_31_20160131_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_833366DF-B1DA-4965-9A07-D64B44632B00_1_1">80837000</us-gaap:ProceedsFromIssuanceOfCommonStock>
  <ardx:GrossProceedsFromIssuanceOfCommonStock contextRef="eol_PE780538--1610-Q0002_STD_31_20160131_0" unitRef="iso4217_USD" decimals="-5" id="id_9429491_833366DF-B1DA-4965-9A07-D64B44632B00_1_3">86300000</ardx:GrossProceedsFromIssuanceOfCommonStock>
  <us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost contextRef="eol_PE780538--1610-Q0002_STD_365_20151231_0_1631490x1776822" unitRef="iso4217_USD" decimals="-5" id="id_9429491_CA67A722-A705-4117-B012-5C9CAB8D4B2A_1004_2">7300000</us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost>
  <us-gaap:ResearchAndDevelopmentExpense contextRef="eol_PE780538--1610-Q0002_STD_365_20151231_0_1631490x1776822" unitRef="iso4217_USD" decimals="-5" id="id_9429491_CA67A722-A705-4117-B012-5C9CAB8D4B2A_1004_3">6000000</us-gaap:ResearchAndDevelopmentExpense>
  <us-gaap:NetCashProvidedByUsedInOperatingActivitiesContinuingOperations contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_15">-8209000</us-gaap:NetCashProvidedByUsedInOperatingActivitiesContinuingOperations>
  <us-gaap:EarningsPerShareBasicAndDiluted contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD_per_shares" decimals="2" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_2_13">-0.19</us-gaap:EarningsPerShareBasicAndDiluted>
  <us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="shares" decimals="-5" id="id_9429491_55ABBCED-2347-4E77-9E43-9C27C1D64712_2_0">1200000</us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount>
  <us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="shares" decimals="0" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_2_16">18606760</us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted>
  <us-gaap:RevenueFromRelatedParties contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_2_2">1999000</us-gaap:RevenueFromRelatedParties>
  <us-gaap:PaymentsToAcquirePropertyPlantAndEquipment contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_17">1055000</us-gaap:PaymentsToAcquirePropertyPlantAndEquipment>
  <us-gaap:NetIncomeLoss contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_1">-3502000</us-gaap:NetIncomeLoss>
  <us-gaap:Revenues contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_2_3">5883000</us-gaap:Revenues>
  <us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_10">336000</us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets>
  <us-gaap:OperatingIncomeLoss contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_2_8">-3490000</us-gaap:OperatingIncomeLoss>
  <us-gaap:LicensesRevenue contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_2_1">3884000</us-gaap:LicensesRevenue>
  <us-gaap:OtherNonoperatingIncomeExpense contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_2_9">-12000</us-gaap:OtherNonoperatingIncomeExpense>
  <us-gaap:IncreaseDecreaseInAccountsReceivable contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_9">-541000</us-gaap:IncreaseDecreaseInAccountsReceivable>
  <us-gaap:GainLossOnSaleOfPropertyPlantEquipment contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_7">-11000</us-gaap:GainLossOnSaleOfPropertyPlantEquipment>
  <us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_2_10">-3502000</us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest>
  <us-gaap:IncomeTaxesPaidNet contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_27">236000</us-gaap:IncomeTaxesPaidNet>
  <us-gaap:CapitalExpendituresIncurredButNotYetPaid contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_29">234000</us-gaap:CapitalExpendituresIncurredButNotYetPaid>
  <us-gaap:IncomeTaxExpenseBenefit contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_2_11">0</us-gaap:IncomeTaxExpenseBenefit>
  <us-gaap:ShareBasedCompensation contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_6">524000</us-gaap:ShareBasedCompensation>
  <us-gaap:IncreaseDecreaseInDeferredRevenue contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_14">-3910000</us-gaap:IncreaseDecreaseInDeferredRevenue>
  <us-gaap:IncreaseDecreaseInOtherAccruedLiabilities contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_13">-134000</us-gaap:IncreaseDecreaseInOtherAccruedLiabilities>
  <us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_23">-8968000</us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease>
  <us-gaap:OperatingExpenses contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_2_7">9373000</us-gaap:OperatingExpenses>
  <us-gaap:NetCashProvidedByUsedInInvestingActivitiesContinuingOperations contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_18">-1055000</us-gaap:NetCashProvidedByUsedInInvestingActivitiesContinuingOperations>
  <us-gaap:NetCashProvidedByUsedInFinancingActivitiesContinuingOperations contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_22">296000</us-gaap:NetCashProvidedByUsedInFinancingActivitiesContinuingOperations>
  <us-gaap:ResearchAndDevelopmentExpense contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_2_5">6198000</us-gaap:ResearchAndDevelopmentExpense>
  <us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_12">-703000</us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities>
  <us-gaap:ProceedsFromStockOptionsExercised contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_21">296000</us-gaap:ProceedsFromStockOptionsExercised>
  <us-gaap:AllocatedShareBasedCompensationExpense contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_EC65F220-FAC1-49CD-8850-E7E8AA22221D_2_2">524000</us-gaap:AllocatedShareBasedCompensationExpense>
  <us-gaap:GeneralAndAdministrativeExpense contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_2_6">3175000</us-gaap:GeneralAndAdministrativeExpense>
  <us-gaap:IncreaseDecreaseInAccountsPayable contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_11">-819000</us-gaap:IncreaseDecreaseInAccountsPayable>
  <us-gaap:Depreciation contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_2_3">119000</us-gaap:Depreciation>
  <ardx:NetIncomeLossAndComprehensiveIncomeLoss contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_2_12">-3502000</ardx:NetIncomeLossAndComprehensiveIncomeLoss>
  <us-gaap:AllocatedShareBasedCompensationExpense contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0_1634394x1639948_1642755x1633925" unitRef="iso4217_USD" decimals="-3" id="id_9429491_EC65F220-FAC1-49CD-8850-E7E8AA22221D_1002_1">238000</us-gaap:AllocatedShareBasedCompensationExpense>
  <us-gaap:AllocatedShareBasedCompensationExpense contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0_1634394x1642216_1642755x1633925" unitRef="iso4217_USD" decimals="-3" id="id_9429491_EC65F220-FAC1-49CD-8850-E7E8AA22221D_2002_0">286000</us-gaap:AllocatedShareBasedCompensationExpense>
  <us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0_1642755x1633925" unitRef="shares" decimals="INF" id="id_9429491_5A3D0A0D-5172-43D6-8750-6045C9926DF2_2_0">26212</us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised>
  <us-gaap:ProceedsFromStockOptionsExercised contextRef="eol_PE780538--1610-Q0002_STD_90_20150331_0_1642755x1633925" unitRef="iso4217_USD" decimals="-5" id="id_9429491_5A3D0A0D-5172-43D6-8750-6045C9926DF2_2_1">100000</us-gaap:ProceedsFromStockOptionsExercised>
  <dei:DocumentFiscalPeriodFocus contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_221DA0EC-701E-4434-9296-D01F2B16532C_1_4">Q1</dei:DocumentFiscalPeriodFocus>
  <us-gaap:NetCashProvidedByUsedInOperatingActivitiesContinuingOperations contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_15">-16247000</us-gaap:NetCashProvidedByUsedInOperatingActivitiesContinuingOperations>
  <dei:DocumentFiscalYearFocus contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_221DA0EC-701E-4434-9296-D01F2B16532C_1_3">2016</dei:DocumentFiscalYearFocus>
  <us-gaap:OrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_60F1C7E9-D2B9-4116-BF93-59C2CFFBB13B_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;NOTE 1. ORGANIZATION AND BASIS OF PRESENTATION&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 Ardelyx, Inc., or the Company, is a clinical-stage
 biopharmaceutical company focused on the discovery, development and
 commercialization of innovative, minimally-systemic therapeutic
 drugs that work exclusively in the gastrointestinal, or GI, tract
 to treat cardio-renal and GI diseases. The Company has developed a
 proprietary drug discovery and design platform enabling it, in a
 rapid and cost-efficient manner, to discover and design novel drug
 candidates. Utilizing its platform, the Company discovered and
 designed its lead product candidate, tenapanor, which is currently
 being evaluated in two pivotal Phase 3 clinical studies in patients
 with constipation-predominant irritable bowel syndrome, or IBS-C.
 In a Phase 2b clinical study, tenapanor demonstrated the ability to
 lower elevated serum phosphorus levels in patients with end-stage
 renal disease, or ESRD. The Company has initiated an additional
 Phase 2b clinical trial to evaluate dosing regimens of tenapanor
 for the treatment of hyperphosphatemia, or elevated serum
 phosphorus in ESRD patients. The Company is developing another drug
 candidate, RDX227675, the lead product candidate from its RDX022
 program, for the treatment of hyperkalemia, or elevated serum
 potassium. The Company is pursuing a 505(b)(2) regulatory pathway
 for RDX227675. The Company has additional drug candidates in
 earlier research and development programs focused in GI and
 cardio-renal diseases, including RDX98940, the lead development
 compound from its RDX009 program focused on secretagogues of
 glucagon-like peptide-1, or GLP-1, and glucagon-like peptide-2, or
 GLP-2, and RDX013 program compounds focused on potassium
 secretagogues.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 18pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;&lt;i&gt;Basis of Presentation&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 These unaudited condensed financial statements and the related
 footnote information of the Company have been prepared pursuant to
 the requirements of the Securities and Exchange Commission, or the
 SEC, for interim reporting. As permitted under those rules and
 regulations, certain footnotes or other financial information that
 are normally required by U.S. generally accepted accounting
 principles (&amp;#x201C;U.S. GAAP&amp;#x201D;) have been condensed or omitted
 pursuant to such rules and regulations. In the opinion of the
 Company&amp;#x2019;s management, the accompanying interim unaudited
 condensed financial statements include all adjustments (consisting
 only of normal recurring adjustments) necessary for a fair
 presentation of the information for the periods presented. The
 results for the quarter ended March&amp;#xA0;31, 2016 are not
 necessarily indicative of results to be expected for the entire
 year ending December&amp;#xA0;31, 2016 or future operating periods.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 The accompanying condensed financial statements and related
 financial information should be read in conjunction with the
 audited financial statements and the related notes thereto for the
 year ended December&amp;#xA0;31, 2015, included in the Company&amp;#x2019;s
 Annual Report on Form 10-K filed with the SEC (the &amp;#x201C;2015 Form
 10-K&amp;#x201D;). The balance sheet at December&amp;#xA0;31, 2015 has been
 derived from the audited financial statements at that date, as
 filed with the 2015 Form 10-K.&lt;/p&gt;
 
 
 &lt;/div&gt;</us-gaap:OrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock>
  <dei:AmendmentFlag contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_221DA0EC-701E-4434-9296-D01F2B16532C_1_1">false</dei:AmendmentFlag>
  <us-gaap:EarningsPerShareBasicAndDiluted contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD_per_shares" decimals="2" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_1_13">-0.70</us-gaap:EarningsPerShareBasicAndDiluted>
  <us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="shares" decimals="-5" id="id_9429491_55ABBCED-2347-4E77-9E43-9C27C1D64712_1_0">4500000</us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount>
  <dei:DocumentType contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_221DA0EC-701E-4434-9296-D01F2B16532C_1_0">10-Q</dei:DocumentType>
  <dei:EntityCentralIndexKey contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_4FC6BF1F-0EEB-4896-9092-41C56452EE88_1_400002">0001437402</dei:EntityCentralIndexKey>
  <us-gaap:HealthCareCostsPolicyPolicyTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_E8B9C76A-7FF0-474B-9AEA-0FCC9EA40C8C_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 18pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;&lt;i&gt;Clinical Trial Accruals&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 Clinical trial costs are a component of research and development
 expenses. The Company accrues and expenses clinical trial
 activities performed by third parties based upon actual work
 completed in accordance with agreements established with clinical
 research organizations and clinical sites. The Company determines
 estimated costs through discussions with internal personnel and
 external service providers as to the progress or stage of
 completion of trials or services and the agreed-upon fee to be paid
 for such services.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 Nonrefundable advance payments for goods and services that will be
 used or rendered in future research and development activities, are
 deferred and recognized as expense in the period that the related
 goods are delivered or services are performed.&lt;/p&gt;
 
 
 &lt;/div&gt;</us-gaap:HealthCareCostsPolicyPolicyTextBlock>
  <dei:EntityFilerCategory contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_4FC6BF1F-0EEB-4896-9092-41C56452EE88_1_400004">Accelerated Filer</dei:EntityFilerCategory>
  <us-gaap:AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_E0BA4354-9055-4304-A197-F294568B7F95_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 18pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;NOTE 7. ACCRUED AND OTHER LIABILITIES&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 Accrued liabilities and other liabilities consist of the following
 (in thousands)&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 12pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;table style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; BORDER-COLLAPSE: collapse; TEXT-TRANSFORM: none; WORD-SPACING: 0px; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px" cellspacing="0" cellpadding="0" width="76%" align="center" border="0"&gt;
 &lt;tr&gt;
 &lt;td width="76%"&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="7%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="7%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;March&amp;#xA0;31,&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;December&amp;#xA0;31,&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;2016&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;2015&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Accrued clinical trial expenses&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;2,740&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;311&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Accrued contract manufacturing&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;662&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;289&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Accrued professional and consulting services&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;324&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;272&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 AZ clinical trial material accrual&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;2,000&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;1,328&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Other&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;539&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;380&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;6,265&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;2,580&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;/table&gt;
 &lt;br class="Apple-interchange-newline" /&gt;&lt;/div&gt;</us-gaap:AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock>
  <us-gaap:CollaborativeArrangementDisclosureTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_3CC79ED8-B55A-4389-ADD8-1A7D7FD60A90_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 18pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;NOTE 4. COLLABORATION AND LICENSING AGREEMENTS&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;&lt;i&gt;AstraZeneca AB (&amp;#x201C;AstraZeneca&amp;#x201D;)&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In October 2012, the Company entered into a collaboration
 partnership with AstraZeneca for the worldwide development and
 commercialization of tenapanor. Under the terms of the AstraZeneca
 collaboration partnership agreement, or the AstraZeneca Agreement,
 the Company received $75.0 million in up-front license fees and
 milestone payments which was recorded as deferred revenue when
 received and were recognized as revenue on a straight-line basis
 over the remaining estimated period of performance under the
 AstraZeneca Agreement, which during the three months ended
 March&amp;#xA0;31, 2015, we estimated to be December 2017.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In June 2015, the Company entered into a termination agreement with
 AstraZeneca (the &amp;#x201C;Termination Agreement&amp;#x201D;) pursuant to
 which all licenses granted to AstraZeneca to the Company&amp;#x2019;s
 portfolio of NHE3 inhibitors, including the Company&amp;#x2019;s lead
 product candidate, tenapanor, were terminated, except for the
 limited purpose of allowing AstraZeneca to satisfy its obligations
 under the Termination Agreement. AstraZeneca was obligated to
 supply the Company with clinical trial materials, drug substance
 and drug product. The maximum amount that the Company is obligated
 to pay for such materials was set at $10.0 million in the
 Termination Agreement, which maximum amount was subsequently
 reduced to $8.0 million pursuant to an amendment to the Termination
 Agreement (&amp;#x201C;Amendment Number One&amp;#x201D;). The Company paid
 AstraZeneca $6.0 million for tenapanor clinical trial material in
 2015. The Company recognized $7.3 and $0.7 million of expense for
 tenapanor clinical trial material for 2015 and for the three months
 ended March&amp;#xA0;31, 2016, respectively. The Company paid
 AstraZeneca $6.0 million for tenapanor clinical trial material in
 2015 and have recorded a $2.0 million accrual as of March&amp;#xA0;31,
 2016.&lt;/p&gt;
 
 
 &lt;/div&gt;</us-gaap:CollaborativeArrangementDisclosureTextBlock>
  <us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_0DBB4BFF-0070-4797-9754-2DEAA4CC1623_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 Accrued liabilities and other liabilities consist of the following
 (in thousands)&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 12pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;table style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; BORDER-COLLAPSE: collapse; TEXT-TRANSFORM: none; WORD-SPACING: 0px; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px" cellspacing="0" cellpadding="0" width="76%" align="center" border="0"&gt;
 &lt;tr&gt;
 &lt;td width="76%"&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="7%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="7%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;March&amp;#xA0;31,&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;December&amp;#xA0;31,&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;2016&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;2015&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Accrued clinical trial expenses&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;2,740&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;311&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Accrued contract manufacturing&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;662&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;289&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Accrued professional and consulting services&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;324&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;272&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 AZ clinical trial material accrual&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;2,000&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;1,328&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Other&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;539&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;380&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;6,265&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;2,580&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;/table&gt;
 &lt;br class="Apple-interchange-newline" /&gt;
 
 &lt;/div&gt;</us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock>
  <us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_DF2E8CA7-690E-43A4-A28F-05DF2E30D491_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 The following table sets forth the fair value of the
 Company&amp;#x2019;s financial assets measured on a recurring basis by
 level within the fair value hierarchy (in thousands):&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 12pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;table style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; BORDER-COLLAPSE: collapse; TEXT-TRANSFORM: none; WORD-SPACING: 0px; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px" cellspacing="0" cellpadding="0" width="92%" align="center" border="0"&gt;
 &lt;tr&gt;
 &lt;td width="70%"&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="3%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="3%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="3%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="3%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="14" align="center"&gt;&lt;b&gt;March&amp;#xA0;31, 2016&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Total&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Level 1&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Level&amp;#xA0;2&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Level&amp;#xA0;3&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Assets:&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Money market funds&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;170,635&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;170,635&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Certificates of deposit&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;100&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;100&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 5em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Total&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;170,735&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;170,635&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;100&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1pt"&gt;
 &lt;td height="16"&gt;&lt;/td&gt;
 &lt;td height="16" colspan="16"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="14" align="center"&gt;&lt;b&gt;December&amp;#xA0;31, 2015&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Total&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Level 1&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Level 2&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Level 3&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Assets:&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Money market funds&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;105,819&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;105,819&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Certificates of deposit&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;100&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;100&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 5em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Total&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;105,919&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;105,819&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;100&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;/table&gt;
 &lt;br class="Apple-interchange-newline" /&gt;
 
 &lt;/div&gt;</us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock>
  <us-gaap:FairValueDisclosuresTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_F0901686-42F9-4471-955F-BE6E179D45DD_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 18pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;NOTE 3. FAIR VALUE MEASUREMENTS&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 Fair value is defined as the exchange price that would be received
 for an asset or paid to transfer a liability (an exit price) in the
 principal or most advantageous market for the asset or liability in
 an orderly transaction between market participants on the
 measurement date. Valuation techniques used to measure fair value
 must maximize the use of observable inputs and minimize the use of
 unobservable inputs.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 The three-level hierarchy for the inputs to valuation techniques is
 briefly summarized as follows:&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 6pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;div style="WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: medium &apos;Times New Roman&apos;; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px" align="right"&gt;
 &lt;table style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; BORDER-COLLAPSE: collapse" cellspacing="0" cellpadding="0" width="96%" border="0"&gt;
 &lt;tr&gt;
 &lt;td width="6%"&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;
 &lt;td width="90%"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;Level&amp;#xA0;1&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="top"&gt;&amp;#x2013;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="top"&gt;Valuations are based on quoted prices in active
 markets for identical assets or liabilities and readily accessible
 by us at the reporting date. Examples of assets and liabilities
 utilizing Level 1 inputs are certain money market funds, U.S.
 Treasuries and trading securities with quoted prices on active
 markets.&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1pt"&gt;
 &lt;td height="8"&gt;&lt;/td&gt;
 &lt;td height="8" colspan="2"&gt;&lt;/td&gt;
 &lt;td height="8" colspan="2"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;Level&amp;#xA0;2&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="top"&gt;&amp;#x2013;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="top"&gt;Valuations based on inputs other than Level 1 that
 are observable, either directly or indirectly, such as quoted
 prices for similar assets or liabilities; quoted prices in markets
 that are not active; or other inputs that are observable or can be
 corroborated by observable market data for substantially the full
 term of the assets or liabilities. Examples of assets and
 liabilities utilizing Level 2 inputs are U.S. government agency
 bonds, corporate bonds, commercial paper, certificates of deposit
 and over-the-counter derivatives.&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1pt"&gt;
 &lt;td height="8"&gt;&lt;/td&gt;
 &lt;td height="8" colspan="2"&gt;&lt;/td&gt;
 &lt;td height="8" colspan="2"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;Level&amp;#xA0;3&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="top"&gt;&amp;#x2013;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="top"&gt;Valuations based on unobservable inputs in which
 there is little or no market data, which require us to develop our
 own assumptions.&lt;/td&gt;
 &lt;/tr&gt;
 &lt;/table&gt;
 &lt;/div&gt;
 &lt;p style="MARGIN-BOTTOM: 0px; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 1px &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12px; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 The following table sets forth the fair value of the
 Company&amp;#x2019;s financial assets measured on a recurring basis by
 level within the fair value hierarchy (in thousands):&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 12pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;table style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; BORDER-COLLAPSE: collapse; TEXT-TRANSFORM: none; WORD-SPACING: 0px; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px" cellspacing="0" cellpadding="0" width="92%" align="center" border="0"&gt;
 &lt;tr&gt;
 &lt;td width="70%"&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="3%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="3%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="3%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="3%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="14" align="center"&gt;&lt;b&gt;March&amp;#xA0;31, 2016&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Total&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Level 1&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Level&amp;#xA0;2&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Level&amp;#xA0;3&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Assets:&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Money market funds&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;170,635&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;170,635&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Certificates of deposit&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;100&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;100&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 5em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Total&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;170,735&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;170,635&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;100&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1pt"&gt;
 &lt;td height="16"&gt;&lt;/td&gt;
 &lt;td height="16" colspan="16"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="14" align="center"&gt;&lt;b&gt;December&amp;#xA0;31, 2015&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Total&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Level 1&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Level 2&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;Level 3&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Assets:&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Money market funds&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;105,819&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;105,819&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Certificates of deposit&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;100&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;100&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 5em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Total&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;105,919&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;105,819&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;100&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap" align="right"&gt;
 &amp;#x2014;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;/table&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 Where quoted prices are available in an active market, securities
 are classified as Level 1. The Company classifies money market
 funds as Level 1. When quoted market prices are not available for
 the specific security, then the Company estimates fair value by
 using benchmark yields, reported trades, broker/dealer quotes, and
 issuer spreads. The Company classifies certificates of deposit as
 Level 2. In certain cases where there is limited activity or less
 transparency around inputs to valuation, securities are classified
 as Level 3. There were no transfers between Level 1 and Level 2
 during the periods presented.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 The carrying amounts reflected in the condensed balance sheets for
 cash equivalents, prepaid expenses and other current assets,
 accounts payable and accrued expenses approximate their fair values
 at March&amp;#xA0;31, 2016 and December&amp;#xA0;31, 2015, due to their
 short-term nature.&lt;/p&gt;
 
 
 &lt;/div&gt;</us-gaap:FairValueDisclosuresTextBlock>
  <us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_23D05B23-C900-4889-AD15-9B7C5155AB94_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; MARGIN-TOP: 6pt; TEXT-INDENT: 4%"&gt;
 &amp;#xA0;Basic and diluted earnings per common share are calculated as
 follows (in thousands, except share and per share data):&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 12pt; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;table style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; BORDER-COLLAPSE: collapse" cellspacing="0" cellpadding="0" width="76%" align="center" border="0"&gt;
 &lt;tr&gt;
 &lt;td width="71%"&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="8%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="8%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="6" align="center"&gt;&lt;b&gt;Three Months Ended&lt;/b&gt;&lt;br /&gt;
 &lt;b&gt;March&amp;#xA0;31,&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;2016&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;2015&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 &lt;b&gt;Numerator:&lt;/b&gt;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Net loss&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;(23,467&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;)&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;(3,502&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;)&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 &lt;b&gt;Denominator:&lt;/b&gt;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; MARGIN-LEFT: 5em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Weighted average common shares outstanding&amp;#x2014;basic and
 diluted&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;33,466,955&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;18,606,760&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Net loss per share&amp;#x2014;basic and diluted&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;(0.70&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;)&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;(0.19&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;)&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;/tr&gt;
 &lt;/table&gt;
 
 
 &lt;/div&gt;</us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock>
  <us-gaap:ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_D17AD71B-CDDE-45D3-8B82-2A7B7E0FCDD6_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 The following table presents stock-based compensation expense
 recognized for stock options, restricted stock units and the
 Company&amp;#x2019;s employee stock purchase program, the ESPP, in the
 Company&amp;#x2019;s statements of operations (in thousands):&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 12pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;table style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; BORDER-COLLAPSE: collapse; TEXT-TRANSFORM: none; WORD-SPACING: 0px; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px" cellspacing="0" cellpadding="0" width="76%" align="center" border="0"&gt;
 &lt;tr&gt;
 &lt;td width="84%"&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="4%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="4%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="6" align="center"&gt;&lt;b&gt;Three&amp;#xA0;Months&amp;#xA0;Ended&lt;br /&gt;
 March&amp;#xA0;31,&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;2016&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;2015&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Research and development&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;626&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;286&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 General and administrative&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;565&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;238&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Total&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;1,191&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;524&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;/table&gt;
 &lt;br class="Apple-interchange-newline" /&gt;
 
 &lt;/div&gt;</us-gaap:ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock>
  <dei:CurrentFiscalYearEndDate contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_4FC6BF1F-0EEB-4896-9092-41C56452EE88_1_400003">--12-31</dei:CurrentFiscalYearEndDate>
  <dei:EntityRegistrantName contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_4FC6BF1F-0EEB-4896-9092-41C56452EE88_1_400001">Ardelyx, Inc.</dei:EntityRegistrantName>
  <us-gaap:FairValueMeasurementPolicyPolicyTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_E48BCD84-9C93-4F25-9FD5-A52D6B0DA7C6_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 Fair value is defined as the exchange price that would be received
 for an asset or paid to transfer a liability (an exit price) in the
 principal or most advantageous market for the asset or liability in
 an orderly transaction between market participants on the
 measurement date. Valuation techniques used to measure fair value
 must maximize the use of observable inputs and minimize the use of
 unobservable inputs.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 The three-level hierarchy for the inputs to valuation techniques is
 briefly summarized as follows:&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 6pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;div style="WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: medium &apos;Times New Roman&apos;; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px" align="right"&gt;
 &lt;table style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; BORDER-COLLAPSE: collapse" cellspacing="0" cellpadding="0" width="96%" border="0"&gt;
 &lt;tr&gt;
 &lt;td width="6%"&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;
 &lt;td width="90%"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;Level&amp;#xA0;1&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="top"&gt;&amp;#x2013;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="top"&gt;Valuations are based on quoted prices in active
 markets for identical assets or liabilities and readily accessible
 by us at the reporting date. Examples of assets and liabilities
 utilizing Level 1 inputs are certain money market funds, U.S.
 Treasuries and trading securities with quoted prices on active
 markets.&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1pt"&gt;
 &lt;td height="8"&gt;&lt;/td&gt;
 &lt;td height="8" colspan="2"&gt;&lt;/td&gt;
 &lt;td height="8" colspan="2"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;Level&amp;#xA0;2&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="top"&gt;&amp;#x2013;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="top"&gt;Valuations based on inputs other than Level 1 that
 are observable, either directly or indirectly, such as quoted
 prices for similar assets or liabilities; quoted prices in markets
 that are not active; or other inputs that are observable or can be
 corroborated by observable market data for substantially the full
 term of the assets or liabilities. Examples of assets and
 liabilities utilizing Level 2 inputs are U.S. government agency
 bonds, corporate bonds, commercial paper, certificates of deposit
 and over-the-counter derivatives.&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1pt"&gt;
 &lt;td height="8"&gt;&lt;/td&gt;
 &lt;td height="8" colspan="2"&gt;&lt;/td&gt;
 &lt;td height="8" colspan="2"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;Level&amp;#xA0;3&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="top"&gt;&amp;#x2013;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="top"&gt;Valuations based on unobservable inputs in which
 there is little or no market data, which require us to develop our
 own assumptions.&lt;/td&gt;
 &lt;/tr&gt;
 &lt;/table&gt;
 &lt;/div&gt;
 
 
 &lt;/div&gt;</us-gaap:FairValueMeasurementPolicyPolicyTextBlock>
  <dei:DocumentPeriodEndDate contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_221DA0EC-701E-4434-9296-D01F2B16532C_1_2">2016-03-31</dei:DocumentPeriodEndDate>
  <us-gaap:StockholdersEquityNoteDisclosureTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_E94C5B47-D242-4BF9-8818-9A318EEAA7BC_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;NOTE 8. STOCKHOLDERS EQUITY&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;&lt;i&gt;Option Exercises&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 For the three months ended March&amp;#xA0;31, 2016, employees exercised
 options to purchase 6,250 shares of the Company&amp;#x2019;s common
 stock with insignificant net proceeds to the Company. For the three
 months ended March&amp;#xA0;31, 2015, employees exercised options to
 purchase 26,212 shares of the Company&amp;#x2019;s common stock with net
 proceeds to the Company of approximately $0.1 million.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 18pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;&lt;i&gt;Employee Stock Purchase Plan&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In February 2016, the Company sold 34,012 shares under the ESPP.
 The shares were purchased at a purchase price of $8.21 per share
 with proceeds to the Company of approximately $0.3 million.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 18pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;&lt;i&gt;Offering of Common Stock and Warrants&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In June 2015, the Company sold and issued an aggregate of 7,242,992
 shares of its common stock and warrants to purchase 2,172,899
 shares of common stock in a private placement transaction for
 aggregate gross proceeds of approximately $77.8 million or net
 proceeds, after deducting issuance costs, of approximately $74.3
 million. The purchase price for the common stock was $10.70 per
 share and the purchase price for the warrants was $0.125 per
 warrant. The warrants are exercisable at an exercise price of
 $13.91 per share at any time prior to the earlier of (i)&amp;#xA0;5
 years from the date of issuance or (ii)&amp;#xA0;certain changes in
 control of the Company. The Company has determined that the
 warrants should be classified as equity. In July 2015, the Company
 filed a registration statement with the SEC registering the resale
 of the common stock and shares of common stock underlying the
 warrants sold and issued in the private placement transaction.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 Other than with respect to warrants issued to holders affiliated
 with New Enterprise Associates, the warrants contain limitations
 that prevent each holder of warrants from acquiring shares upon
 exercise of the warrants that would cause the number of shares
 beneficially owned by it and its affiliates to exceed 9.99% of the
 total number of shares of the Company&amp;#x2019;s common stock then
 issued and outstanding. In addition, upon certain changes in
 control of the Company, each holder of a warrant can elect to
 receive, subject to certain limitations and assumptions, securities
 in a successor entity. None of the warrants issued in June 2015
 have been exercised as of March&amp;#xA0;31, 2016.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In January 2016, the Company completed an underwritten public
 offering of 8,625,000 shares of common stock at an offering price
 of $10.00 per share for gross proceeds of $86.3 million. The
 Company received net proceeds from the offering of approximately
 $80.8 million, after deducting the underwriters&amp;#x2019; discounts
 and commissions and offering expenses.&lt;/p&gt;
 
 
 &lt;/div&gt;</us-gaap:StockholdersEquityNoteDisclosureTextBlock>
  <us-gaap:UseOfEstimates contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_60066983-B440-4EFD-8A1B-CCCBCBEDD72D_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;&lt;i&gt;Use of Estimates&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 The preparation of financial statements in conformity with U.S.
 GAAP requires management to make estimates and assumptions that
 affect the amounts reported in the financial statements and
 accompanying notes. Although management believes these estimates
 are based upon reasonable assumptions within the bounds of its
 knowledge of the Company&amp;#x2019;s business and operations, actual
 results could differ materially from those estimates.&lt;/p&gt;
 &lt;/div&gt;</us-gaap:UseOfEstimates>
  <us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_BB3A7EC0-4A77-45F0-94CE-BD7AD5A2C886_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;NOTE 5. STOCK-BASED COMPENSATION&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 The following table presents stock-based compensation expense
 recognized for stock options, restricted stock units and the
 Company&amp;#x2019;s employee stock purchase program, the ESPP, in the
 Company&amp;#x2019;s statements of operations (in thousands):&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 12pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;table style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; BORDER-COLLAPSE: collapse; TEXT-TRANSFORM: none; WORD-SPACING: 0px; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px" cellspacing="0" cellpadding="0" width="76%" align="center" border="0"&gt;
 &lt;tr&gt;
 &lt;td width="84%"&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="4%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="4%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="6" align="center"&gt;&lt;b&gt;Three&amp;#xA0;Months&amp;#xA0;Ended&lt;br /&gt;
 March&amp;#xA0;31,&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;2016&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;2015&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Research and development&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;626&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;286&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 General and administrative&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;565&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;238&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Total&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;1,191&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;524&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;/table&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 At March&amp;#xA0;31, 2016, the Company had $12.7 million, $1.0 million
 and $0.1 million of total unrecognized compensation expense, net of
 estimated forfeitures, related to stock option grants, restricted
 stock units and purchase rights, respectively, that will be
 recognized over an average vesting period of 3.4 years, 3.6 years
 and 0.4 years, respectively.&lt;/p&gt;
 
 
 &lt;/div&gt;</us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock>
  <us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_386A99BD-3EEE-4398-84CF-459428A7EE5C_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;&lt;i&gt;Recent Accounting Pronouncements&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In May, 2014, the Financial Accounting Standards Board
 (&amp;#x201C;FASB&amp;#x201D;) issued Accounting Standards Update
 (&amp;#x201C;ASU&amp;#x201D;) 2014-09,&amp;#xA0;&lt;i&gt;Revenue from Contracts with
 Customers&lt;/i&gt;&amp;#xA0;(&amp;#x201C;ASU 2014-09&amp;#x201D;),
 which requires an entity to recognize the amount of revenue to
 which it expects to be entitled for the transfer of promised goods
 or services to customers. ASU 2014-09 will replace most existing
 revenue recognition guidance in U.S.&amp;#xA0;GAAP when it becomes
 effective. In July 2015, the FASB voted to approve a deferral of
 the effective date of this ASU by one year, and to permit entities
 to adopt up to one year earlier if they choose. Therefore, the new
 standard will become effective for the Company on January&amp;#xA0;1,
 2018 and early application is permitted for periods beginning on or
 after January&amp;#xA0;1, 2017. The standard permits the use of either
 the retrospective or cumulative effect transition method. The
 Company is evaluating the effect that ASU 2014-09 will have on its
 condensed financial statements and related disclosures. The Company
 has not yet selected an implementation date or a transition method
 nor has it determined the effect of the standard on its ongoing
 financial reporting.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In August 2014, the FASB issued ASU No.&amp;#xA0;2014-15,&amp;#xA0;&lt;i&gt;Presentation of Financial
 Statements&amp;#x2014;Going Concern: Disclosure of Uncertainties about
 an Entity&amp;#x2019;s Ability to Continue as a Going
 Concern&amp;#xA0;&lt;/i&gt;(&amp;#x201C;ASU
 2014-15&amp;#x201D;). ASU 2014-15 is intended to define
 management&amp;#x2019;s responsibility to evaluate whether there is
 substantial doubt about an organization&amp;#x2019;s ability to continue
 as a going concern and to provide related footnote disclosures, if
 required. ASU 2014-15 is effective for annual reporting periods
 ending after December&amp;#xA0;15, 2016, and applies to annual and
 interim periods thereafter. The Company is evaluating the impact
 that the adoption of ASU 2014-15 will have on its condensed
 financial statements and related disclosures.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In February 2016, the FASB issued ASU No.&amp;#xA0;2016-02,&amp;#xA0;&lt;i&gt;Leases (Topic 842)&lt;/i&gt;.
 Under the new guidance, lessees will be required to recognize a
 lease liability and a right-of-use asset for all leases (with the
 exception of short term leases) at the commencement date. Lessor
 accounting under ASU 2016-02 is largely unchanged. ASU 2016-02 is
 effective for annual and interim periods beginning on or after
 December&amp;#xA0;15, 2018 and early adoption is permitted. Under ASU
 2016-02, lessees (for capital and operating leases) and lessors
 (for sales-type, direct financing, and operating leases) must apply
 a modified retrospective transition approach for leases existing
 at, or entered into after, the beginning of the earliest
 comparative period presented in the financial statements. Lessees
 and lessors may not apply a full retrospective transition approach.
 The Company has not yet selected an implementation date nor has it
 determined the effect of the standard on its ongoing financial
 reporting.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In March 2016, the FASB issued Accounting Standards
 2016-09,&amp;#xA0;&lt;i&gt;Improvements to Employee
 Share-Based Payment Accounting&lt;/i&gt;, which amends ASC Topic 718,
 Stock Compensation. The objective of this amendment is part of the
 FASB&amp;#x2019;s Simplification Initiative as it applies to several
 aspects of the accounting for share-based payment transactions,
 including the income tax consequences, classification of awards as
 either equity or liabilities, and classification on the statement
 of cash flows. This pronouncement is effective for the Company on
 July&amp;#xA0;1, 2017, and allows for prospective, retrospective or
 modified retrospective adoption, depending on the area covered in
 the update, with early adoption permitted. The Company is currently
 evaluating the impact on our condensed financial statements and the
 timing of adoption.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 The Company has reviewed all other significant newly-issued
 accounting pronouncements and concluded that they either are not
 applicable to the Company&amp;#x2019;s operations or that no material
 effect is expected on its condensed financial statements as a
 result of future adoption.&lt;/p&gt;
 &lt;/div&gt;</us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock>
  <us-gaap:SignificantAccountingPoliciesTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_EE32A7E5-91B6-42E5-8463-B5CB3A06CECB_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 18pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;NOTE 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;&lt;i&gt;Use of Estimates&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 The preparation of financial statements in conformity with U.S.
 GAAP requires management to make estimates and assumptions that
 affect the amounts reported in the financial statements and
 accompanying notes. Although management believes these estimates
 are based upon reasonable assumptions within the bounds of its
 knowledge of the Company&amp;#x2019;s business and operations, actual
 results could differ materially from those estimates.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 18pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;&lt;i&gt;Clinical Trial Accruals&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 Clinical trial costs are a component of research and development
 expenses. The Company accrues and expenses clinical trial
 activities performed by third parties based upon actual work
 completed in accordance with agreements established with clinical
 research organizations and clinical sites. The Company determines
 estimated costs through discussions with internal personnel and
 external service providers as to the progress or stage of
 completion of trials or services and the agreed-upon fee to be paid
 for such services.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 Nonrefundable advance payments for goods and services that will be
 used or rendered in future research and development activities, are
 deferred and recognized as expense in the period that the related
 goods are delivered or services are performed.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0px; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 1px &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 18px; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;&lt;i&gt;Recent Accounting Pronouncements&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In May, 2014, the Financial Accounting Standards Board
 (&amp;#x201C;FASB&amp;#x201D;) issued Accounting Standards Update
 (&amp;#x201C;ASU&amp;#x201D;) 2014-09,&amp;#xA0;&lt;i&gt;Revenue from Contracts with
 Customers&lt;/i&gt;&amp;#xA0;(&amp;#x201C;ASU 2014-09&amp;#x201D;),
 which requires an entity to recognize the amount of revenue to
 which it expects to be entitled for the transfer of promised goods
 or services to customers. ASU 2014-09 will replace most existing
 revenue recognition guidance in U.S.&amp;#xA0;GAAP when it becomes
 effective. In July 2015, the FASB voted to approve a deferral of
 the effective date of this ASU by one year, and to permit entities
 to adopt up to one year earlier if they choose. Therefore, the new
 standard will become effective for the Company on January&amp;#xA0;1,
 2018 and early application is permitted for periods beginning on or
 after January&amp;#xA0;1, 2017. The standard permits the use of either
 the retrospective or cumulative effect transition method. The
 Company is evaluating the effect that ASU 2014-09 will have on its
 condensed financial statements and related disclosures. The Company
 has not yet selected an implementation date or a transition method
 nor has it determined the effect of the standard on its ongoing
 financial reporting.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In August 2014, the FASB issued ASU No.&amp;#xA0;2014-15,&amp;#xA0;&lt;i&gt;Presentation of Financial
 Statements&amp;#x2014;Going Concern: Disclosure of Uncertainties about
 an Entity&amp;#x2019;s Ability to Continue as a Going
 Concern&amp;#xA0;&lt;/i&gt;(&amp;#x201C;ASU
 2014-15&amp;#x201D;). ASU 2014-15 is intended to define
 management&amp;#x2019;s responsibility to evaluate whether there is
 substantial doubt about an organization&amp;#x2019;s ability to continue
 as a going concern and to provide related footnote disclosures, if
 required. ASU 2014-15 is effective for annual reporting periods
 ending after December&amp;#xA0;15, 2016, and applies to annual and
 interim periods thereafter. The Company is evaluating the impact
 that the adoption of ASU 2014-15 will have on its condensed
 financial statements and related disclosures.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In February 2016, the FASB issued ASU No.&amp;#xA0;2016-02,&amp;#xA0;&lt;i&gt;Leases (Topic 842)&lt;/i&gt;.
 Under the new guidance, lessees will be required to recognize a
 lease liability and a right-of-use asset for all leases (with the
 exception of short term leases) at the commencement date. Lessor
 accounting under ASU 2016-02 is largely unchanged. ASU 2016-02 is
 effective for annual and interim periods beginning on or after
 December&amp;#xA0;15, 2018 and early adoption is permitted. Under ASU
 2016-02, lessees (for capital and operating leases) and lessors
 (for sales-type, direct financing, and operating leases) must apply
 a modified retrospective transition approach for leases existing
 at, or entered into after, the beginning of the earliest
 comparative period presented in the financial statements. Lessees
 and lessors may not apply a full retrospective transition approach.
 The Company has not yet selected an implementation date nor has it
 determined the effect of the standard on its ongoing financial
 reporting.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In March 2016, the FASB issued Accounting Standards
 2016-09,&amp;#xA0;&lt;i&gt;Improvements to Employee
 Share-Based Payment Accounting&lt;/i&gt;, which amends ASC Topic 718,
 Stock Compensation. The objective of this amendment is part of the
 FASB&amp;#x2019;s Simplification Initiative as it applies to several
 aspects of the accounting for share-based payment transactions,
 including the income tax consequences, classification of awards as
 either equity or liabilities, and classification on the statement
 of cash flows. This pronouncement is effective for the Company on
 July&amp;#xA0;1, 2017, and allows for prospective, retrospective or
 modified retrospective adoption, depending on the area covered in
 the update, with early adoption permitted. The Company is currently
 evaluating the impact on our condensed financial statements and the
 timing of adoption.&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 The Company has reviewed all other significant newly-issued
 accounting pronouncements and concluded that they either are not
 applicable to the Company&amp;#x2019;s operations or that no material
 effect is expected on its condensed financial statements as a
 result of future adoption.&lt;/p&gt;
 
 
 &lt;/div&gt;</us-gaap:SignificantAccountingPoliciesTextBlock>
  <dei:TradingSymbol contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_4FC6BF1F-0EEB-4896-9092-41C56452EE88_1_400000">ARDX</dei:TradingSymbol>
  <us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="shares" decimals="0" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_1_16">33466955</us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted>
  <us-gaap:EarningsPerShareTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_577BD993-0DAA-4ED6-82C3-52436764ECA9_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 18pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;NOTE 6. NET LOSS PER SHARE&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 Basic net loss per share is calculated by dividing the net loss by
 the weighted-average number of shares of common stock outstanding
 during the period. Diluted net loss per common share is computed
 giving effect to all potential dilutive common shares, including
 common stock issuable upon exercise of stock options, and unvested
 restricted common stock and stock units. As the Company had net
 losses for the three months ended March&amp;#xA0;31, 2016 and 2015, all
 potential common stock equivalents were determined to be
 anti-dilutive. Basic and diluted earnings per common share are
 calculated as follows (in thousands, except share and per share
 data):&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 12pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 0pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;table style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; BORDER-COLLAPSE: collapse; TEXT-TRANSFORM: none; WORD-SPACING: 0px; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px" cellspacing="0" cellpadding="0" width="76%" align="center" border="0"&gt;
 &lt;tr&gt;
 &lt;td width="71%"&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="8%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td valign="bottom" width="8%"&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;td&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="6" align="center"&gt;&lt;b&gt;Three Months Ended&lt;/b&gt;&lt;br /&gt;
 &lt;b&gt;March&amp;#xA0;31,&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 8pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;2016&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td style="BORDER-BOTTOM: rgb(0,0,0) 1pt solid" valign="bottom" colspan="2" align="center"&gt;&lt;b&gt;2015&lt;/b&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 1em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 &lt;b&gt;Numerator:&lt;/b&gt;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Net loss&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;(23,467&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;)&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;(3,502&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;)&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 &lt;b&gt;Denominator:&lt;/b&gt;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 5em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Weighted average common shares outstanding&amp;#x2014;basic and
 diluted&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;33,466,955&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;18,606,760&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 1px solid; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;" bgcolor="#CCEEFF"&gt;
 &lt;td valign="top"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: &apos;Times New Roman&apos;; MARGIN-LEFT: 3em; MARGIN-TOP: 0pt; TEXT-INDENT: -1em"&gt;
 Net loss per share&amp;#x2014;basic and diluted&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;(0.70&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;)&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;$&lt;/td&gt;
 &lt;td valign="bottom" align="right"&gt;(0.19&lt;/td&gt;
 &lt;td valign="bottom" nowrap="nowrap"&gt;)&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;tr style="FONT-SIZE: 1px"&gt;
 &lt;td valign="bottom"&gt;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td valign="bottom"&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; BORDER-TOP: rgb(0,0,0) 3px double; MARGIN-TOP: 0pt"&gt;
 &amp;#xA0;&lt;/p&gt;
 &lt;/td&gt;
 &lt;td&gt;&amp;#xA0;&lt;/td&gt;
 &lt;/tr&gt;
 &lt;/table&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 12pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 For the three months ended March&amp;#xA0;31, 2016 and 2015, the total
 number of anti-dilutive outstanding common stock equivalents
 excluded from the net loss per common share computation was
 4.5&amp;#xA0;million and 1.2&amp;#xA0;million, respectively.&lt;/p&gt;
 &lt;/div&gt;</us-gaap:EarningsPerShareTextBlock>
  <us-gaap:SubsequentEventsTextBlock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_E3C0E9E5-1869-4790-9F25-7AED95882481_1_0">&lt;div&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 18pt; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"&gt;
 &lt;b&gt;NOTE 9. SUBSEQUENT EVENTS&lt;/b&gt;&lt;/p&gt;
 &lt;p style="MARGIN-BOTTOM: 0pt; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; COLOR: rgb(0,0,0); FONT: 10pt &apos;Times New Roman&apos;; WIDOWS: 1; MARGIN-TOP: 6pt; LETTER-SPACING: normal; TEXT-INDENT: 4%; -webkit-text-stroke-width: 0px"&gt;
 In April 2016, the Company signed the third amendment to its
 facility lease agreement in Fremont, California to add space and to
 extend the lease term through September 2021. In addition, the
 amended lease agreement provides for a tenant improvement allowance
 of up to $0.4 million. The extended lease has rent escalation
 clauses through the lease term. Rent increases, including the
 impact of a rent holiday and leasehold improvement allowance from
 the landlord, will be recognized as deferred rent and amortized on
 a straight-line basis over the term of the lease. The total minimum
 lease payments for the extended lease are approximately $5.8
 million.&lt;/p&gt;
 
 
 &lt;/div&gt;</us-gaap:SubsequentEventsTextBlock>
  <us-gaap:PaymentsToAcquirePropertyPlantAndEquipment contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_17">200000</us-gaap:PaymentsToAcquirePropertyPlantAndEquipment>
  <us-gaap:NetIncomeLoss contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_1">-23467000</us-gaap:NetIncomeLoss>
  <us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_10">-881000</us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets>
  <us-gaap:OperatingIncomeLoss contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_1_8">-23529000</us-gaap:OperatingIncomeLoss>
  <us-gaap:OtherNonoperatingIncomeExpense contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_1_9">62000</us-gaap:OtherNonoperatingIncomeExpense>
  <us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_1_10">-23467000</us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest>
  <us-gaap:CapitalExpendituresIncurredButNotYetPaid contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_29">16000</us-gaap:CapitalExpendituresIncurredButNotYetPaid>
  <us-gaap:IncomeTaxExpenseBenefit contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_1_11">0</us-gaap:IncomeTaxExpenseBenefit>
  <us-gaap:ShareBasedCompensation contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_6">1191000</us-gaap:ShareBasedCompensation>
  <us-gaap:IncreaseDecreaseInOtherAccruedLiabilities contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_13">3656000</us-gaap:IncreaseDecreaseInOtherAccruedLiabilities>
  <us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_23">64674000</us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease>
  <us-gaap:OperatingExpenses contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_1_7">23529000</us-gaap:OperatingExpenses>
  <us-gaap:NetCashProvidedByUsedInInvestingActivitiesContinuingOperations contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_18">-200000</us-gaap:NetCashProvidedByUsedInInvestingActivitiesContinuingOperations>
  <us-gaap:NetCashProvidedByUsedInFinancingActivitiesContinuingOperations contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_22">81121000</us-gaap:NetCashProvidedByUsedInFinancingActivitiesContinuingOperations>
  <us-gaap:ResearchAndDevelopmentExpense contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_1_5">19250000</us-gaap:ResearchAndDevelopmentExpense>
  <us-gaap:ProceedsFromIssuanceOfCommonStock contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_20">80837000</us-gaap:ProceedsFromIssuanceOfCommonStock>
  <us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_12">-1047000</us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities>
  <us-gaap:ProceedsFromStockOptionsExercised contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_21">284000</us-gaap:ProceedsFromStockOptionsExercised>
  <us-gaap:AllocatedShareBasedCompensationExpense contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_EC65F220-FAC1-49CD-8850-E7E8AA22221D_1_2">1191000</us-gaap:AllocatedShareBasedCompensationExpense>
  <us-gaap:CostOfServicesAmortization contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_5">47000</us-gaap:CostOfServicesAmortization>
  <us-gaap:GeneralAndAdministrativeExpense contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_1_6">4279000</us-gaap:GeneralAndAdministrativeExpense>
  <us-gaap:AmortizationOfFinancingCosts contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_4">80000</us-gaap:AmortizationOfFinancingCosts>
  <us-gaap:IncreaseDecreaseInAccountsPayable contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_11">2102000</us-gaap:IncreaseDecreaseInAccountsPayable>
  <us-gaap:Depreciation contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_B3295B87-D090-4F1C-8718-03ACE96DB1CF_1_3">310000</us-gaap:Depreciation>
  <ardx:NetIncomeLossAndComprehensiveIncomeLoss contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="iso4217_USD" decimals="-3" id="id_9429491_BAD02DF3-8619-468E-8F2E-1317D8C4491C_1_12">-23467000</ardx:NetIncomeLossAndComprehensiveIncomeLoss>
  <ardx:ClassOfWarrantOrRightNumberOfWarrantsExercised contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" unitRef="shares" decimals="INF" id="id_9429491_0B729B2E-5F94-4E1F-B7E3-42E9E93C557C_2_1">0</ardx:ClassOfWarrantOrRightNumberOfWarrantsExercised>
  <ardx:ClassOfWarrantOrRightExpirationDateDescription contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0" id="id_9429491_060E3F46-D6F2-40A1-BAB2-BB601679B4F5_2_8">The warrants are exercisable at an exercise price of $13.91 per share at any time prior to the earlier of (i) 5 years from the date of issuance or (ii) certain changes in control of the Company.</ardx:ClassOfWarrantOrRightExpirationDateDescription>
  <us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0_1631490x1776822" unitRef="iso4217_USD" decimals="-5" id="id_9429491_CA67A722-A705-4117-B012-5C9CAB8D4B2A_1003_2">700000</us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost>
  <us-gaap:AllocatedShareBasedCompensationExpense contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0_1634394x1639948_1642755x1633925" unitRef="iso4217_USD" decimals="-3" id="id_9429491_EC65F220-FAC1-49CD-8850-E7E8AA22221D_1001_1">565000</us-gaap:AllocatedShareBasedCompensationExpense>
  <us-gaap:AllocatedShareBasedCompensationExpense contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0_1634394x1642216_1642755x1633925" unitRef="iso4217_USD" decimals="-3" id="id_9429491_EC65F220-FAC1-49CD-8850-E7E8AA22221D_2001_0">626000</us-gaap:AllocatedShareBasedCompensationExpense>
  <us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0_1642755x1633925" unitRef="shares" decimals="INF" id="id_9429491_5A3D0A0D-5172-43D6-8750-6045C9926DF2_1_0">6250</us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised>
  <us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0_1642755x1633925" id="id_9429491_7099E236-C635-4F47-B96C-B9C2FBCA11E6_1_1">P3Y4M24D</us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1>
  <us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0_1642755x1637723" id="id_9429491_7099E236-C635-4F47-B96C-B9C2FBCA11E6_2_1">P3Y7M6D</us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1>
  <us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 contextRef="eol_PE780538--1610-Q0002_STD_91_20160331_0_1642755x1974116" id="id_9429491_7099E236-C635-4F47-B96C-B9C2FBCA11E6_3_1">P4M24D</us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1>
  <context id="eol_PE780538--1610-Q0002_STD_91_20160331_0_1642755x1974116">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:AwardTypeAxis">ardx:PurchaseRightsMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2016-01-01</startDate>
      <endDate>2016-03-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_91_20160331_0_1642755x1637723">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:AwardTypeAxis">us-gaap:RestrictedStockUnitsRSUMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2016-01-01</startDate>
      <endDate>2016-03-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_91_20160331_0_1642755x1633925">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:AwardTypeAxis">us-gaap:EmployeeStockOptionMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2016-01-01</startDate>
      <endDate>2016-03-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_91_20160331_0_1634394x1642216_1642755x1633925">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:AwardTypeAxis">us-gaap:EmployeeStockOptionMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:IncomeStatementLocationAxis">us-gaap:ResearchAndDevelopmentExpenseMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2016-01-01</startDate>
      <endDate>2016-03-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_91_20160331_0_1634394x1639948_1642755x1633925">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:AwardTypeAxis">us-gaap:EmployeeStockOptionMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:IncomeStatementLocationAxis">us-gaap:GeneralAndAdministrativeExpenseMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2016-01-01</startDate>
      <endDate>2016-03-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_91_20160331_0_1631490x1776822">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:CounterpartyNameAxis">ardx:AstraZenecaMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2016-01-01</startDate>
      <endDate>2016-03-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_91_20160331_0">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
    </entity>
    <period>
      <startDate>2016-01-01</startDate>
      <endDate>2016-03-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_90_20150331_0_1642755x1633925">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:AwardTypeAxis">us-gaap:EmployeeStockOptionMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2015-01-01</startDate>
      <endDate>2015-03-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_90_20150331_0_1634394x1642216_1642755x1633925">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:AwardTypeAxis">us-gaap:EmployeeStockOptionMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:IncomeStatementLocationAxis">us-gaap:ResearchAndDevelopmentExpenseMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2015-01-01</startDate>
      <endDate>2015-03-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_90_20150331_0_1634394x1639948_1642755x1633925">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:AwardTypeAxis">us-gaap:EmployeeStockOptionMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:IncomeStatementLocationAxis">us-gaap:GeneralAndAdministrativeExpenseMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2015-01-01</startDate>
      <endDate>2015-03-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_90_20150331_0">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
    </entity>
    <period>
      <startDate>2015-01-01</startDate>
      <endDate>2015-03-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_365_20151231_0_1631490x1776822">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:CounterpartyNameAxis">ardx:AstraZenecaMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2015-01-01</startDate>
      <endDate>2015-12-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_31_20160131_0">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
    </entity>
    <period>
      <startDate>2016-01-01</startDate>
      <endDate>2016-01-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_31_20121031_0_1631490x1776822">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:CounterpartyNameAxis">ardx:AstraZenecaMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2012-10-01</startDate>
      <endDate>2012-10-31</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_30_20150630_0_1631490x1776822_1639304x1633605">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:CounterpartyNameAxis">ardx:AstraZenecaMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:RangeAxis">us-gaap:MaximumMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2015-06-01</startDate>
      <endDate>2015-06-30</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_30_20150630_0">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
    </entity>
    <period>
      <startDate>2015-06-01</startDate>
      <endDate>2015-06-30</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_29_20160229_0_1639657x1944181">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:PlanNameAxis">ardx:EmployeeStockPurchasePlanMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2016-02-01</startDate>
      <endDate>2016-02-29</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_21_20151130_0_1631490x1776822_1639304x1633605">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:CounterpartyNameAxis">ardx:AstraZenecaMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:RangeAxis">us-gaap:MaximumMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2015-11-10</startDate>
      <endDate>2015-11-30</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_1_20160430_0_1636141x1633766_1639226x2015016">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:LeaseArrangementTypeAxis">ardx:AmendedFacilityLeaseAgreementMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:SubsequentEventTypeAxis">us-gaap:SubsequentEventMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <startDate>2016-04-30</startDate>
      <endDate>2016-04-30</endDate>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20151231_0_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2015-12-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20151231_0_1637541x1640681_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByAssetClassAxis">us-gaap:CertificatesOfDepositMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2015-12-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20151231_0_1637541x1637231_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByAssetClassAxis">us-gaap:MoneyMarketFundsMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2015-12-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20151231_0_1634760x1643241_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByFairValueHierarchyLevelAxis">us-gaap:FairValueInputsLevel1Member</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2015-12-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20151231_0_1634760x1643241_1637541x1637231_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByAssetClassAxis">us-gaap:MoneyMarketFundsMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByFairValueHierarchyLevelAxis">us-gaap:FairValueInputsLevel1Member</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2015-12-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20151231_0_1634760x1637150_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByFairValueHierarchyLevelAxis">us-gaap:FairValueInputsLevel2Member</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2015-12-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20151231_0_1634760x1637150_1637541x1640681_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByAssetClassAxis">us-gaap:CertificatesOfDepositMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByFairValueHierarchyLevelAxis">us-gaap:FairValueInputsLevel2Member</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2015-12-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20151231_0_1631490x1776822">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:CounterpartyNameAxis">ardx:AstraZenecaMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2015-12-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20151231_0">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
    </entity>
    <period>
      <instant>2015-12-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20141231_0">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
    </entity>
    <period>
      <instant>2014-12-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160331_0_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2016-03-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160331_0_1642755x1974116">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:AwardTypeAxis">ardx:PurchaseRightsMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2016-03-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160331_0_1642755x1637723">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:AwardTypeAxis">us-gaap:RestrictedStockUnitsRSUMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2016-03-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160331_0_1642755x1633925">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:AwardTypeAxis">us-gaap:EmployeeStockOptionMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2016-03-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160331_0_1637541x1640681_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByAssetClassAxis">us-gaap:CertificatesOfDepositMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2016-03-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160331_0_1637541x1637231_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByAssetClassAxis">us-gaap:MoneyMarketFundsMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2016-03-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160331_0_1634760x1643241_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByFairValueHierarchyLevelAxis">us-gaap:FairValueInputsLevel1Member</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2016-03-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160331_0_1634760x1643241_1637541x1637231_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByAssetClassAxis">us-gaap:MoneyMarketFundsMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByFairValueHierarchyLevelAxis">us-gaap:FairValueInputsLevel1Member</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2016-03-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160331_0_1634760x1637150_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByFairValueHierarchyLevelAxis">us-gaap:FairValueInputsLevel2Member</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2016-03-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160331_0_1634760x1637150_1637541x1640681_1643666x1641611">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:FairValueByAssetClassAxis">us-gaap:CertificatesOfDepositMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByFairValueHierarchyLevelAxis">us-gaap:FairValueInputsLevel2Member</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:FairValueByMeasurementFrequencyAxis">us-gaap:FairValueMeasurementsRecurringMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2016-03-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160331_0_1631490x1776822">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:CounterpartyNameAxis">ardx:AstraZenecaMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2016-03-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160331_0">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
    </entity>
    <period>
      <instant>2016-03-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20150331_0">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
    </entity>
    <period>
      <instant>2015-03-31</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20150630_0">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
    </entity>
    <period>
      <instant>2015-06-30</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160229_0_1639657x1944181">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:PlanNameAxis">ardx:EmployeeStockPurchasePlanMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2016-02-29</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160505_0">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
    </entity>
    <period>
      <instant>2016-05-05</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160430_0_1636141x1633766_1639226x2015016">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
      <segment><xbrldi:explicitMember dimension="us-gaap:LeaseArrangementTypeAxis">ardx:AmendedFacilityLeaseAgreementMember</xbrldi:explicitMember><xbrldi:explicitMember dimension="us-gaap:SubsequentEventTypeAxis">us-gaap:SubsequentEventMember</xbrldi:explicitMember></segment>
    </entity>
    <period>
      <instant>2016-04-30</instant>
    </period>
  </context>
  <context id="eol_PE780538--1610-Q0002_STD_0_20160131_0">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0001437402</identifier>
    </entity>
    <period>
      <instant>2016-01-31</instant>
    </period>
  </context>
  <unit id="iso4217_USD_per_shares">
    <divide>
      <unitNumerator>
        <measure>iso4217:USD</measure>
      </unitNumerator>
      <unitDenominator>
        <measure>shares</measure>
      </unitDenominator>
    </divide>
  </unit>
  <unit id="iso4217_USD">
    <measure>iso4217:USD</measure>
  </unit>
  <unit id="shares">
    <measure>shares</measure>
  </unit>
  <unit id="pure">
    <measure>pure</measure>
  </unit>
</xbrl>





