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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 10, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Entity Registrant Name Adicet Bio, Inc.    
Entity Central Index Key 0001720580    
Entity File Number 001-38359    
Trading Symbol ACET    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Public Float     $ 226.0
Entity Common Stock, Shares Outstanding   39,877,109  
Document Annual Report true    
Document Transition Report false    
Entity Tax Identification Number 81-3305277    
Entity Incorporation, State or Country Code DE    
Security Exchange Name NASDAQ    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Entity Address, Address Line One 200 Clarendon Street    
Entity Address, Address Line Two Floor 6    
Entity Address, City or Town Boston    
Entity Address, State or Province MA    
City Area Code 650    
Local Phone Number 503-9095    
Entity Address, Postal Zip Code 02116    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
ICFR Auditor Attestation Flag false    
Auditor Firm ID 185    
Auditor Name KPMG LLP    
Auditor Location Boston, Massachusetts    
Documents Incorporated by Reference

Part III of this Annual Report on Form 10-K incorporates by reference certain information from the registrant’s definitive Proxy Statement for its 2022 annual meeting of shareholders, scheduled to be held on June 2, 2022, which the registrant intends to file pursuant to Regulation 14A with the Securities and Exchange Commission not later than 120 days after the registrant’s fiscal year end of December 31, 2021. Except with respect to information specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part of this Form 10-K.