0001437402 dei:OtherAddressMember 2021-03-11 2021-03-11 0001437402 2021-03-11 2021-03-11 0001437402 false 8-K 2021-03-11 ARDELYX, INC. DE 001-36485 26-1303944 34175 Ardenwood Blvd. Fremont CA 94555 400 Fifth Ave. Suite 210 Waltham MA 02456 510 745-1700 false false false false false Common Stock, par value $0.0001 ARDX NASDAQ