0001437402 dei:OtherAddressMember 2021-04-29 2021-04-29 0001437402 2021-04-29 2021-04-29 0001437402 false CA 8-K 2021-04-29 ARDELYX, INC. DE 001-36485 26-1303944 34175 ARDENWOOD BLVD. FREMONT 94555 400 FIFTH AVE. SUITE 210 WALTHAM MA 02451 510 745-1700 false false false false Common Stock, par value $0.0001 ARDX NASDAQ false