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

Quarterly report pursuant to Section 13 or 15(d)

Share Capital - Additional Information (Detail)

Share Capital - Additional Information (Detail) - USD ($)											3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 27, 2023	May 17, 2023	Apr. 20, 2023	Mar. 03, 2023	Jan. 03, 2023	Dec. 23, 2022	Dec. 08, 2022	Nov. 23, 2022	Sep. 19, 2022	Jun. 24, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Fair value adjustment of warrants											$ 0	$ 100,000	$ 0	$ 100,000
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation											30,000		231,000
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount											1,600,000		$ 1,600,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition													1 year 9 months
Stock Issued During Period, Shares, New Issues			9,255	27,930	15,628
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			3,103										7,776
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation			$ 100,000										$ 200,000
Share based payment arrangement plan modification fair value of award											$ 0		$ 0
Share-based compensation arrangement by share-based payment award, award vesting period	3 years							3 years	1 year
Share-based compensation arrangement by share-based payment award, number of shares authorized												26,881		26,881		363,921
Share-based compensation arrangement by share-based payment award, shares issued in period	12,950	25,977						7,317	27,108
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period		5,587							7,843				28,694		263,155
Share-based compensation arrangement by share-based payment award, equity instruments other than options, expected to vest in period		20,391							19,265
Warrant Liability [Member]
Derivative liabilities															$ 0
Julius Kalcevich [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based compensation arrangement by share-based payment award, shares issued in period							27,930
Key Employees [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based compensation arrangement by share-based payment award, award vesting period						3 years
Share-based compensation arrangement by share-based payment award, shares issued in period						21,400
Common Stock [Member]
Stock Issued Under Recapitalization Transaction Shares												6,072,580,000		6,072,580,000
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation											(3,103,000)		(7,776,000)
Common Stock [Member] \| Secured Lenders and Unsecured Lenders [Member]
Stock Issued Under Recapitalization Transaction Shares										6,072,580
Maximum [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based compensation arrangement by share-based payment award, award vesting period		3 years
Minimum [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based compensation arrangement by share-based payment award, award vesting period		1 year
Stock Options Member
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount											$ 100,000		$ 100,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition													10 days
Share based payment arrangement plan modification fair value of award											0		$ 0
Share-based compensation arrangement by share-based payment award, award vesting period													3 years
Selling, general and administrative expenses
Share-based payment arrangement expense											100,000	$ 300,000	$ 100,000	$ 1,800,000
Selling, general and administrative expenses \| Restricted Stock Units (RSUs) [Member]
Share-based payment arrangement expense											$ 1,600,000	$ 21,000,000	$ 3,100,000	$ 21,000,000