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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Apr. 20, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K/A    
Amendment Flag true    
Document Period End Date Dec. 31, 2025    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Document Transition Report false    
Document Annual Report true    
Trading Symbol ACHV    
Entity Incorporation, State or Country Code DE    
Entity Registrant Name Achieve Life Sciences, Inc.    
Entity Central Index Key 0000949858    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity File Number 033-80623    
Entity Tax Identification Number 95-4343413    
Entity Address, Address Line One 1040 West Georgia Street    
Entity Address, Address Line Two Suite 1030    
Entity Address, City or Town Vancouver    
Entity Address, State or Province BC    
Entity Address, Postal Zip Code V6E 4H1    
City Area Code 604    
Local Phone Number 210-2217    
Entity Common Stock, Shares Outstanding   102,659,057  
Entity Public Float     $ 103,958,994
Title of 12(b) Security Common Stock, par value $0.001 per share    
Security Exchange Name NASDAQ    
ICFR Auditor Attestation Flag false    
Auditor Firm ID 271    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Location Vancouver, Canada    
Document Financial Statement Error Correction [Flag] false    
Amendment Description This Amendment No. 1 on Form 10-K/A (“Amendment No. 1”) is being filed to amend our Annual Report on Form 10-K for the fiscal year ended December 31, 2025 (the “Original Filing”), filed with the U.S. Securities and Exchange Commission (the "SEC") on March 24, 2026 (the “Original Filing Date”). We are amending and refiling Part III to include information required by Items 10, 11, 12, 13 and 14 because our definitive proxy statement will not be filed within 120 days after December 31, 2025, the end of the fiscal year covered by our Annual Report on Form 10-K.  Pursuant to the rules of the SEC, we have also included as exhibits currently dated certifications required under Section 302 of The Sarbanes-Oxley Act of 2002. Because no financial statements are contained within this Amendment, certifications pursuant to Section 906 of The Sarbanes-Oxley Act of 2002 are not being furnished herewith. We are amending and refiling Part IV to reflect the inclusion of those certifications, along with any changes to Part IV that occurred after the date of the Original Filing.  In addition, we made certain revisions to the cover page, including the deletion of the reference to our proxy statement and the amendment to our Annual Report on Form 10-K and inclusion of updated outstanding share information. Except as described above, no other changes have been made to the Original Filing.  Except as otherwise indicated herein, this Amendment continues to speak as of the date of the Original Filing, and we have not updated the disclosures contained therein to reflect any events that occurred subsequent to the date of the Original Filing. The filing of this Amendment is not a representation that any statements contained in items of our annual report on Form 10-K other than Part III, Items 10 through 14, Part IV and the aforementioned portions of the cover page are true or complete as of any date subsequent to the Original Filing.    
Other Address      
Document Information [Line Items]      
Entity Address, Address Line One 22722 29th Drive SE    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town Bothell    
Entity Address, State or Province WA    
Entity Address, Postal Zip Code 98021