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

Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Detail)

Long-Term Debt - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands									3 Months Ended		9 Months Ended
	Jun. 24, 2022	Feb. 02, 2021	Jul. 13, 2020	Dec. 20, 2019	Sep. 30, 2019	May 02, 2019	Mar. 18, 2019	May 14, 2018	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Feb. 01, 2022	Dec. 31, 2021	Apr. 04, 2021	Jul. 10, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Debt instrument face value													$ 4,600
Interest expense									$ 0	$ 400	$ 800	$ 1,300
Accretion expense									1,020	767	2,561	8,283
Secured debt long term fair value									$ 138,650		$ 138,650			$ 242,104
Class of warrants or rights exercise price per share									$ 0		$ 0			$ 3.56
Cash balance									$ 22,705		$ 22,705			$ 13,244
Loss on extinguishment of debt									0	0	(316,577)	0
Share issuance - recapitalization transaction value											455,443
Interest accrued on current and long term debt									$ 0		$ 0
Other Equity Method Investees [Member]
Debt Instrument [Line Items]
Equity Method Investment, Ownership Percentage									10.00%		10.00%
June Secured Debentures [Member]
Debt Instrument [Line Items]
Interest expense									$ 2,100	0	$ 2,200	0
Secured debt long term fair value	$ 84,500
June Secured Debentures [Member] \| Secured Debenture Purchase Agreement [Member]
Debt Instrument [Line Items]
Debt instrument face value	$ 99,700
Debt instrument maturity date	Jun. 24, 2027
Accretion expense									700	0	800	0
June Secured Debentures [Member] \| Secured Debenture Purchase Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument interest percentage on event of default	11.00%
June Secured Debentures [Member] \| Secured Debenture Purchase Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	8.00%
June Unsecured Debentures [Member]
Debt Instrument [Line Items]
Interest expense									400	0	400	0
Secured debt long term fair value	$ 14,900
June Unsecured Debentures [Member] \| Secured Debenture Purchase Agreement [Member]
Debt Instrument [Line Items]
Debt instrument face value	$ 20,000
Debt instrument maturity date	Jun. 24, 2027
Accretion expense									200	0	200	0
June Unsecured Debentures [Member] \| Secured Debenture Purchase Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument interest percentage on event of default	11.00%
June Unsecured Debentures [Member] \| Secured Debenture Purchase Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	8.00%
Additional Secured Debentures [Member]
Debt Instrument [Line Items]
Interest expense									500	0	500	0
Secured debt long term fair value	$ 25,000
Additional Secured Debentures [Member] \| Secured Debenture Purchase Agreement [Member]
Debt Instrument [Line Items]
Debt instrument face value	$ 25,000
Debt instrument maturity date	Jun. 24, 2027
Additional Secured Debentures [Member] \| Secured Debenture Purchase Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate on secured notes interest increase decrease	11.00%
Additional Secured Debentures [Member] \| Secured Debenture Purchase Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	8.00%
Extinguishment of Non Recapitalization Transaction Debts [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs									100		100			2,500
Debt issuance costs, net									700		$ 700			7,700
Common Stock [Member]
Debt Instrument [Line Items]
Share issuance - Recapitalization Transaction, Shares											6,072,580,000
Recapitalization transaction [Member]
Debt Instrument [Line Items]
Debt instrument face value																$ 14,700
Debt instrument, face amount											$ 119,700
Percentage of outstanding shares Held	2.75%
Debt conversion, original debt, amount											238,200
Interest accrued on current and long term debt									$ 56,300		$ 56,300			45,600
Recapitalization transaction [Member] \| Common Stock [Member]
Debt Instrument [Line Items]
Share issuance - Recapitalization Transaction, Shares											6,072,580
Share issuance - recapitalization transaction value											$ 455,400
Recapitalization transaction [Member] \| Secured And Unsecured Lenders [Member]
Debt Instrument [Line Items]
Percentage of outstanding shares Held									97.25%		97.25%
Debt issuance costs, net														30,300
Private Placement [Member] \| March 2019 Equity Warrants [Member]
Debt Instrument [Line Items]
Debt instrument maturity date							Mar. 15, 2023
Interest rate on secured notes																	8.00%
Debt instrument terms of interest payment							payable quarterly
Interest expense										700		2,100
Accretion expense										400		1,100
Class of warrants or rights number of shares covered by warrants or rights							2,177,291
Class of warrants or rights exercise price per share							$ 6.43
Private Placement [Member] \| May 2019 Equity Warrants [Member]
Debt Instrument [Line Items]
Debt instrument maturity date						Mar. 15, 2023
Debt instrument terms of interest payment						payable quarterly
Interest expense									$ 0		$ 1,000
Accretion expense									0		$ 400
Class of warrants or rights number of shares covered by warrants or rights						1,555,207
Class of warrants or rights exercise price per share						$ 6.43
Class of warrant or rights expiry date						Mar. 15, 2022
Private Placement [Member] \| In Cash [Member] \| March 2019 Equity Warrants [Member]
Debt Instrument [Line Items]
Percentage of total interest that can be paid through cash or in kind route							50.00%
I Anthus New Jersey LLC [Member]
Debt Instrument [Line Items]
Description about qualified financing											“Qualified Financing” means a transaction or series of related transactions resulting in net proceeds to the Company of not less than $10 million from the subscription of the Company’s securities, including, but not limited to, a private placement or rights offering.
Threshold limit of qualified financing, net proceeds not less than the subscription of securities											$ 10,000
Lenders [Member] \| June Secured Debentures [Member] \| Minimum [Member] \| Other Equity Method Investees [Member]
Debt Instrument [Line Items]
Equity Method Investment, Ownership Percentage	10.00%
Lenders [Member] \| June Unsecured Debentures [Member] \| Minimum [Member] \| Other Equity Method Investees [Member]
Debt Instrument [Line Items]
Equity Method Investment, Ownership Percentage	10.00%
Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument debt default amount	$ 97,500
Long term debt default amount accrued interest	$ 38,500
Long term debt exit fee payable									10,300		10,300
Secured Debt [Member] \| Recapitalization transaction [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	Jul. 13, 2025
Interest rate on secured notes	13.00%
Secured debt long term fair value									99,400		99,400
Debt instrument, face amount											119,700
Debt conversion, original debt, amount	$ 14,700
Secured Debt [Member] \| Tranche One [Member]
Debt Instrument [Line Items]
Debt instrument face value								$ 40,000
Debt instrument maturity date								May 14, 2021
Interest rate on secured notes								16.00%
Debt instrument conversion price per share								$ 3.08
Debt instrument beneficial conversion feature								$ 7,900
Interest expense									0	1,700	3,200	5,000
Accretion expense									0	0	0	2,400
Debt instrument debt default amount									97,500		97,500				$ 60,000
Long term debt default amount accrued interest									38,500		38,500				$ 11,900
Long term debt exit fee payable principal and interest	$ 16,200									15,000		15,000
Long term debt exit fee payable									10,300	10,300	10,300	10,300
Interest payable on exit fee									$ 5,900	4,700	$ 5,900	4,700
Debt instrument financial covenant description											The terms also contain a financial covenant requiring the Company’s asset value to be 1.75 times the total net debt at each quarter end and requires that the Company maintain a minimum cash balance of $1.0 million while the Tranche One Secured Notes remained outstanding (the “market value test”).
Financial covenant requires to maintain ratio of asset value to net debt									1.75		1.75
Cash balance									$ 1,000		$ 1,000
Secured Debt [Member] \| Tranche One [Member] \| Accretion Expense [Member]
Debt Instrument [Line Items]
Amortization of debt discount									0	0	0	1,000
Secured Debt [Member] \| Tranche Two [Member]
Debt Instrument [Line Items]
Debt instrument face value					$ 20,000
Debt instrument maturity date					May 14, 2021
Interest rate on secured notes					13.00%
Interest expense									0	800	1,600	2,400
Accretion expense									0	0	0	700
Secured Debt [Member] \| Tranche Three [Member]
Debt Instrument [Line Items]
Debt instrument face value				$ 36,200
Debt instrument maturity date				May 14, 2021
Interest rate on secured notes				13.00%
Interest expense									0	1,500	2,800	4,400
Accretion expense									0	0	0	1,600
Secured Debt [Member] \| Tranche Four [Member]
Debt Instrument [Line Items]
Debt instrument face value			$ 14,700
Debt instrument maturity date			Jul. 13, 2025
Interest expense									0	300	700	900
Accretion expense									0	100	200	300
Debt instrument original issue discount percentage			8.00%
New Jersey Senior Secured Bridge Notes [Member]
Debt Instrument [Line Items]
Percentage of outstanding shares Held	10.00%
New Jersey Senior Secured Bridge Notes [Member] \| I Anthus New Jersey LLC [Member]
Debt Instrument [Line Items]
Debt instrument face value		$ 11,000
Debt instrument maturity date		Feb. 02, 2023
Interest rate on secured notes		14.00%
Interest expense									300	400	1,100	1,000
Accretion expense									100	100	300	200
Secured debt long term fair value		$ 10,300
Unamortized debt issuance costs		$ 700
Escrow deposit									0		0			3,300
New Jersey Senior Secured Bridge Notes [Member] \| Prospective Recapitalization Transaction [Member] \| I Anthus New Jersey LLC [Member]
Debt Instrument [Line Items]
Interest rate on secured notes		8.00%
New Jersey Senior Secured Bridge Notes [Member] \| Prospective Default [Member] \| I Anthus New Jersey LLC [Member]
Debt Instrument [Line Items]
Interest rate on secured notes		25.00%
March 2019 Debentures [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Debt instrument face value							$ 35,000
Interest expense									0		1,400
Accretion expense									$ 0		$ 700
March 2019 Debentures [Member] \| Private Placement [Member] \| In Cash [Member]
Debt Instrument [Line Items]
Percentage of total interest that can be paid through cash or in kind route							50.00%
May 2019 Debentures [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Debt instrument face value						$ 25,000
Interest rate on secured notes									8.00%		8.00%
Interest expense										500		1,500
Accretion expense										$ 200		$ 600
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt instrument debt default amount	$ 60,000
Long term debt default amount accrued interest	$ 11,900
Unsecured Debt [Member] \| Recapitalization transaction [Member]
Debt Instrument [Line Items]
Interest rate on secured notes	8.00%
Debt conversion, original debt, amount											$ 238,200
Secured Debt and Unsecured Debt [Member]
Debt Instrument [Line Items]
Long term debt default amount accrued additional fess and interest	$ 16,200
Secured Debt and Unsecured Debt [Member] \| Recapitalization transaction [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs									$ 19,300		19,300			$ 3,200
Debt issuance costs, net									$ 20,300		$ 20,300