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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 04, 2022
Jun. 30, 2021
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2021    
Entity File Number 001-37467    
Entity Registrant Name Astria Therapeutics, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-3687168    
Entity Address, Address Line One 100 High Street    
Entity Address, Address Line Two Floor 28    
Entity Address, City or Town Boston    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02110    
City Area Code 617    
Local Phone Number 349-1971    
Title of 12(b) Security Common Stock, $0.001 par value per share    
Trading Symbol ATXS    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   13,016,955  
Entity Public Float     $ 129,863,570
Entity Central Index Key 0001454789    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
ICFR Auditor Attestation Flag false    
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location Boston, Massachusetts