Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
3 Months Ended
Mar. 31, 2020
May 14, 2020
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Document Transition Report false  
Document Quarterly 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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
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, Country CA  
Entity Address, Postal Zip Code V6E 4H1  
City Area Code 604  
Local Phone Number 210-2217  
Entity Common Stock, Shares Outstanding   37,515,408
Title of 12(b) Security Common Stock, par value $0.001 per share  
Security Exchange Name NASDAQ