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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Mar. 03, 2025
Jun. 30, 2024
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
Current Fiscal Year End Date --12-31    
Entity Registrant Name Q32 Bio Inc.    
Entity Central Index Key 0001661998    
Entity Voluntary Filers Yes    
Entity Well-known Seasoned Issuer No    
Entity File Number 001-38433    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 47-3468154    
Entity Address, Address Line One 830 Winter Street    
Entity Address, City or Town Waltham    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02451    
Entity Interactive Data Current Yes    
Entity Current Reporting Status Yes    
City Area Code 781    
Local Phone Number 999-0232    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Title of 12(b) Security Common stock, par value $0.0001 per share    
Trading Symbol QTTB    
Security Exchange Name NASDAQ    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 136.4
Entity Common Stock, Shares Outstanding   12,197,615  
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Certain portions of the information required to be furnished pursuant to Part III of this Annual Report on Form 10-K will be set forth in, and incorporated by reference from, the Registrant’s definitive proxy statement for the annual meeting of stockholders or an amendment to this Annual Report on Form 10-K which will be filed with the Securities and Exchange Commission no later than 120 days after the end of the fiscal year ended December 31, 2024.

    
Auditor Firm ID 42    
Auditor Location Boston, Massachusetts, USA    
Auditor Name Ernst & Young LLP