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Contingencies	9 Months Ended
Contingencies	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Contingencies	CONTINGENCIES On July 30, 2021, a putative securities class action lawsuit was commenced in the U.S. District Court for the Northern District of California naming as defendants Ardelyx and two current officers. The complaint alleges that the defendants violated Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, and Rule 10b-5 thereunder, by making false and misleading statements and omissions of material fact related to tenapanor. The plaintiff seeks to represent all persons who purchased or otherwise acquired Ardelyx securities between August 6, 2020, and July 19, 2021. The plaintiff seeks damages and interest, and an award of costs, including attorneys’ fees. We believe the plaintiff’s claims are without merit and we have not recorded any accrual for a contingent liability associated with these legal proceedings. From time to time we may be involved in claims arising in connection with our business. Based on information currently available, management believes that the amount, or range, of reasonably possible losses in connection with any pending actions against us would not be material to our financial condition or cash flows, and no contingent liabilities were accrued as of September 30, 2021 or 2020.