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Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Feb. 12, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-36485    
Entity Registrant Name ARDELYX, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-1303944    
Entity Address, Address Line One 400 Fifth Avenue    
Entity Address, Address Line Two Suite 210    
Entity Address, City or Town Waltham    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02451    
City Area Code 510    
Local Phone Number 745-1700    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol ARDX    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 923,706,456
Entity Common Stock, Shares Outstanding   245,247,427  
Entity Central Index Key 0001437402    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Documents Incorporated by Reference
Portions of the Registrant’s Definitive Proxy Statement for its 2026 Annual Meeting of Stockholders, which will be filed with the Commission within 120 days of December 31, 2025, the close of the Registrant’s 2025 fiscal year, are incorporated by reference into Part III of this Report.