Annual report pursuant to Section 13 and 15(d)

Cover Page

Cover Page - USD ($)
12 Months Ended
Dec. 31, 2021
Feb. 28, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
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 false    
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 420 Lexington Avenue    
Entity Address, City or Town Suite 414    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10170    
City Area Code 646    
Local Phone Number 518-9411    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Document Annual Report true    
Document Transition Report false    
Entity Incorporation, State or Country Code CA    
ICFR Auditor Attestation Flag false    
Entity Common Stock, Shares Outstanding   171,718,192  
Entity Public Float     $ 188.5000
Auditor Name Marcum LLP    
Auditor Firm ID 688    
Auditor Location NY