Annual report pursuant to Section 13 and 15(d)

Cover Page

Cover Page - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Mar. 21, 2024
Jun. 30, 2023
Cover [Abstract]        
Document Type 10-K      
Amendment Flag false      
Document Period End Date Dec. 31, 2023      
Document Fiscal Year Focus 2023      
Document Fiscal Period Focus FY      
Entity Registrant Name IANTHUS CAPITAL HOLDINGS, INC.      
Entity Central Index Key 0001643154      
Current Fiscal Year End Date --12-31      
Entity Current Reporting Status Yes      
Entity Filer Category Non-accelerated Filer      
Entity Shell Company true      
Entity Small Business true      
Entity Emerging Growth Company true      
Entity Ex Transition Period false      
Entity Interactive Data Current Yes      
Entity File Number 000-56228      
Entity Tax Identification Number 98-1360810      
Entity Address, Address Line One 214 King Street      
Entity Address, City or Town Suite 314      
Entity Address, State or Province ON      
Entity Address, Postal Zip Code M5H 3S6      
City Area Code 646      
Local Phone Number 518-9418      
Entity Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
Document Annual Report true      
Document Transition Report false      
Entity Incorporation, State or Country Code Z4      
ICFR Auditor Attestation Flag false      
Document Financial Statement Error Correction [Flag] false      
Entity Common Stock, Shares Outstanding     6,615,001,520  
Entity Public Float       $ 21.7
Auditor Name PKF O’Connor Davies, LLP Marcum LLP    
Auditor Firm ID 127 688    
Auditor Location New York, NY New York, NY