iAnthus Capital Holdings, Inc. Quarterly report [Sections 13 or 15(d)]

Quarterly report [Sections 13 or 15(d)]

Long-Term Debt - Additional Information (Detail)

Long-Term Debt - Additional Information (Detail) $ in Thousands						3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 16, 2026 USD ($)	Feb. 16, 2024 USD ($) Days	Feb. 02, 2023 USD ($)	Jun. 24, 2022 USD ($)	Feb. 02, 2021 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Debt Instrument [Line Items]
Debt instrument, issuance costs, net						$ 22,000		$ 22,000		$ 21,900
Debt instrument, unamortized discount costs						4,500		4,500		6,500
Interest expense								8,405	$ 8,283
Accretion expense						1,106	$ 1,212	2,237	2,401
Long term debt, fair value						$ 198,234		$ 198,234		186,489
Other Equity Method Investees [Member]
Debt Instrument [Line Items]
Company's acquisition equity interests						5.00%		5.00%
June Secured Debentures [Member]
Debt Instrument [Line Items]
Debt instrument, face value				$ 99,700
Debt instrument, maturity date				Jun. 24, 2027
Interest expense						$ 2,700	2,600	$ 5,400	5,000
Accretion expense						800	700	1,600	1,500
Long term debt, fair value				$ 84,500		164,585		164,585		154,569
June Secured Debentures [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate stated percentage				8.00%
June Secured Debentures [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument interest percentage on event of default				11.00%
June Unsecured Debentures [Member]
Debt Instrument [Line Items]
Debt instrument, face value				$ 20,000
Debt instrument, maturity date				Jun. 24, 2027
Interest expense						500	500	1,100	1,000
Accretion expense						300	200	500	500
Long term debt, fair value				$ 14,900
June Unsecured Debentures [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate stated percentage				8.00%
June Unsecured Debentures [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument interest percentage on event of default				11.00%
Additional Secured Debentures [Member]
Debt Instrument [Line Items]
Interest expense						600	600	1,300	1,200
Long term debt, 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] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate stated percentage				8.00%
Additional Secured Debentures [Member] \| Secured Debenture Purchase Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument interest percentage on event of default				11.00%
Long-Term Debt [Member]
Debt Instrument [Line Items]
Debt instrument, interest paid						500		$ 500		1,500
iAnthus New Jersey LLC [Member]
Debt Instrument [Line Items]
Debt instrument, description about qualified financing								“Qualified Financing” means a transaction or series of related transactions resulting in net proceeds to the ICH of not less than $10 million from the subscription of the ICH's securities, including, but not limited to, a private placement or rights offering.
Lenders [Member] \| June Secured Debentures [Member] \| Minimum [Member] \| Other Equity Method Investees [Member]
Debt Instrument [Line Items]
Company's acquisition equity interests				5.00%
Lenders [Member] \| June Unsecured Debentures [Member] \| Minimum [Member] \| Other Equity Method Investees [Member]
Debt Instrument [Line Items]
Company's acquisition equity interests				5.00%
Lenders [Member] \| Additional Secured Debentures [Member] \| Minimum [Member] \| Other Equity Method Investees [Member]
Debt Instrument [Line Items]
Company's acquisition equity interests				5.00%
2024 NJ Amendment [Member] \| iAnthus New Jersey LLC [Member]
Debt Instrument [Line Items]
Debt Instrument Redemption Price Percentage Of Principal Amount Redeemed	2.00%
Investment Owned Balance Principal Amount	$ 8,400
Amount Of Impairment To Carrying Amount Of Regulatory Assets						200		$ 200
Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate stated percentage				8.00%
New Jersey Senior Secured Bridge Notes [Member]
Debt Instrument [Line Items]
Percentage of outstanding shares held								5.00%
New Jersey Senior Secured Bridge Notes [Member] \| iAnthus New Jersey LLC [Member]
Debt Instrument [Line Items]
Debt instrument, face value			$ 1,400		$ 11,000
Debt instrument, maturity date			Feb. 02, 2024		Feb. 02, 2023
Debt instrument, interest rate on secured notes					14.00%
Debt instrument, threshold limit of qualified financing, net proceeds not less than the subscription of securities								$ 10,000
Debt instrument, interest rate stated percentage			12.00%
Debt instrument, percentage of total outstanding debt instrument principal amount			10.00%
Interest expense						200	400	500	800
Accretion expense						$ 100	$ 200	100	$ 400
Long term debt, fair value		$ 8,200
New Jersey Senior Secured Bridge Notes [Member] \| Prospective Default [Member] \| iAnthus New Jersey LLC [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate on secured notes					8.00%
New Jersey Senior Secured Bridge Notes [Member] \| 2024 NJ Amendment [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date, range end	Jun. 24, 2027
Debt Instrument Issued Principal	$ 11,000
New Jersey Senior Secured Bridge Notes [Member] \| 2024 NJ Amendment [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument Issuance Date 1	Feb. 02, 2021
New Jersey Senior Secured Bridge Notes [Member] \| 2024 NJ Amendment [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Feb. 16, 2026
New Jersey Senior Secured Bridge Notes [Member] \| 2024 NJ Amendment [Member] \| iAnthus New Jersey LLC [Member]
Debt Instrument [Line Items]
Debt instrument, face value		$ 1,600
Non-Operational Cash Receipts								$ 300		$ 7,400
Debt instrument, interest rate stated percentage		12.00%
Debt instrument, percentage of total outstanding debt instrument principal amount		10.00%
Debt instrument, first quarterly payment date		May 16, 2024
Debt instrument, convertible, threshold trading days \| Days		20
Debt instrument, non-operational cash receipts, utilization rate		25.00%
Debt instrument, payment towards outstanding principal amount		$ 5,000
New Jersey Senior Secured Bridge Notes [Member] \| 2024 NJ Amendment [Member] \| iAnthus New Jersey LLC [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date, range start		Feb. 16, 2024
New Jersey Senior Secured Bridge Notes [Member] \| 2024 NJ Amendment [Member] \| iAnthus New Jersey LLC [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date, range start		Feb. 16, 2026