0001437402 2021-10-08 2021-10-08 0001437402 dei:OtherAddressMember 2021-10-08 2021-10-08 0001437402 false 8-K 2021-10-08 ARDELYX, INC. DE 001-36485 26-1303944 400 FIFTH AVE. SUITE 210 WALTHAM MA 02451 510 745-1700 false false false false Common Stock, par value $0.0001 ARDX NASDAQ false