iAnthus Capital Holdings, Inc. Annual report [Section 13 and 15(d), not S-K Item 405]

Financial Instruments - Summary Of Changes In Level One and Level Three Financial Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on equity method investments	$ (13)	$ (211)
4 Front Venture Corp.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	10	56
Additions	0	0
Revaluations	(8)	(46)
Loss on equity method investments	0	0
Ending balance	2	10
Other Long-term Investments [Member] \| The Pharm Stand, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	125	0
Additions	0	125
Revaluations	0	0
Loss on equity method investments	0	0
Ending balance	125	125
Other Long-term Investments [Member] \| Island Thyme LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	728	679
Additions	0	260
Revaluations	0	0
Loss on equity method investments	(13)	(211)
Ending balance	$ 715	$ 728

Amount of income (loss) for proportionate share of equity method investee's income (loss).