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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Apr. 10, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 000-56075    
Entity Registrant Name 4Front Ventures Corp.    
Entity Incorporation, State or Country Code A1    
Entity Tax Identification Number 83-4168417    
Entity Address, Address Line One 7010 E. Chauncey Lane    
Entity Address, Address Line Two Suite 235    
Entity Address, City or Town Phoenix    
Entity Address, State or Province AZ    
Entity Address, Postal Zip Code 85054    
City Area Code 602    
Local Phone Number 633-3067    
Title of 12(g) Security Class A Subordinate Voting Shares, no par value    
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 true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 88,955,560
Entity Common Stock, Shares Outstanding   912,923,993  
Documents Incorporated by Reference
None.
    
Entity Central Index Key 0001783875    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false