iAnthus Capital Holdings, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Organization and Description of Business - Additional Information (Detail)

Organization and Description of Business - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Feb. 02, 2023	Jun. 24, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Feb. 01, 2022	Jan. 01, 2022	Feb. 02, 2021	Jul. 10, 2020
Net loss			$ (15,572)	$ (21,995)	$ (54,316)	$ (405,659)
Accumulated deficit			$ (1,305,339)		(1,305,339)		$ (1,251,023)		$ (801,632)
Debt instrument face amount								$ 4,600
Net Cash Provided by (Used in) Operating Activities					$ 4,745	$ (14,145)
Common Stock, Shares, Outstanding			6,459,844,000		6,459,844,000		6,403,289,000
Recapitalization transaction [Member]
Debt instrument face amount											$ 14,700
Stock issued during period, shares, new issues		6,072,580
Percentage of outstanding shares Held		2.75%	97.25%		97.25%
Common Stock, Shares, Outstanding		6,244,298
Debt conversion, original debt, amount					$ 238,200
Secured Notes Conversion to June Secured Debentures [Member] \| Recapitalization transaction [Member]
Debt conversion, original debt, amount		$ 5,000
Existing Shareholders [Member] \| Recapitalization transaction [Member]
Common Stock, Shares, Outstanding		171,718
Secured Debt [Member] \| Recapitalization transaction [Member]
Interest rate on secured notes		13.00%
Debt conversion, original debt, amount		$ 14,700
Debt instrument maturity date		Jul. 13, 2025
Secured Debt [Member] \| Secured Notes Conversion to June Secured Debentures [Member] \| Recapitalization transaction [Member]
Debt conversion, original debt, amount		$ 99,700
Secured Debt [Member] \| Secured Lenders [Member] \| Recapitalization transaction [Member]
Stock issued during period, shares, new issues		3,036,290
Percentage of outstanding shares Held		48.625%
Secured Debt [Member] \| Secured Lenders [Member] \| Secured Debenture Purchase Agreement [Member]
Debt instrument face amount		$ 99,700
Interest rate on secured notes		8.00%
Debt instrument maturity date		Jun. 24, 2027
Debt instrument, interest rate		8.00%
Debt instrument interest percentage on event of default		11.00%
Debt instrument, redemption price, percentage of principal amount redeemed		103.00%
Percentage of total outstanding debt instrument principal amount		90.00%
Secured Debt [Member] \| Gotham Green Partners, LLC and Affiliates [Member] \| Secured Debenture Purchase Agreement [Member]
Percentage of outstanding shares Held		50.00%
Maximum threshold remuneration payable to director		$ 25
Unsecured Debt [Member] \| Recapitalization transaction [Member]
Interest rate on secured notes		8.00%
Debt conversion, original debt, amount					$ 238,200
Unsecured Debt [Member] \| UnSecured Debenture Purchase Agreement [Member]
Debt instrument face amount		$ 20,000
Debt instrument maturity date		Jun. 24, 2027
Debt instrument, interest rate		8.00%
Debt instrument interest percentage on event of default		11.00%
Debt instrument, redemption price, percentage of principal amount redeemed		103.00%
Percentage of total outstanding debt instrument principal amount		90.00%
Unsecured Debt [Member] \| Conversion to June Unsecured Debentures \| Recapitalization transaction [Member]
Debt conversion, original debt, amount		$ 15,000
Unsecured Debt [Member] \| Secured Lenders [Member] \| UnSecured Debenture Purchase Agreement [Member]
Debt instrument face amount		$ 5,000
Unsecured Debt [Member] \| Unsecured Lenders [Member] \| Recapitalization transaction [Member]
Stock issued during period, shares, new issues		3,036,290
Percentage of outstanding shares Held		48.625%
Unsecured Debt [Member] \| Unsecured Lenders [Member] \| UnSecured Debenture Purchase Agreement [Member]
Debt instrument face amount		$ 15,000
Additional Secured Debentures [Member] \| Secured Debenture Purchase Agreement [Member]
Debt instrument face amount		$ 25,000
Senior Secured Bridge Notes [Member] \| I Anthus New Jersey LLC [Member]
Debt instrument face amount										$ 11,000
Debt instrument maturity date	Feb. 02, 2021