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

Financial Instruments - Summary of Changes in Level One and Level Three Financial Assets (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on equity method investments	$ (162)	$ (0)
4 Front Venture Corp [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	56
Revaluations	(28)
Ending balance	28
Other Long-term Investments [Member] \| The Pharm Stand, LLC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	0
Additions	125
Ending balance	125
Other Long-term Investments [Member] \| Island Thyme LLC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	679
Additions	195
Loss on equity method investments	(162)
Ending balance	$ 712

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