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

Quarterly report [Sections 13 or 15(d)]

Contingencies And Guarantees - Additional Information (Detail)

Contingencies And Guarantees - Additional Information (Detail) - USD ($) shares in Thousands												6 Months Ended	36 Months Ended
	Jan. 05, 2026	Sep. 19, 2025	Aug. 20, 2025	Aug. 08, 2025	Jun. 20, 2025	Jun. 15, 2025	Jun. 04, 2025	Apr. 05, 2023	Aug. 19, 2021	Aug. 23, 2019	Apr. 24, 2019	Jun. 30, 2026	Jan. 05, 2029	Dec. 31, 2025
Contingencies And Guarantees [Line Items]
Loss contingency plaintiffs value						$ 5,500,000
Loss Contingency, Settlement Agreement, Court						(i) $1,250,000 within five (5) business days of executing the Roberts Settlement Agreement; (ii) $150,000 on January 5, 2026; and (iii) starting January 5, 2026, $4,100,000 in equal monthly installments over thirty-six (36) months, bearing a simple interest rate of 6% per year. On June 16, 2025, the parties filed a Joint Stipulation to Dismiss this matter with prejudice, which was approved by the court on June 17, 2025.
Claim for alleged payments											$ 1,300,000
Disputed Debentures And Related Indenture Amount											111,000,000
Breach Of Security Subordination Agreement Amount											$ 3,500,000
Damages For Breach Of Consultancy Agreement							$ 400,000
Damages For Breach Of Consultancy Agreement Plus Certain Warrants							200,000
Damages For Breach Of The Duty Of Good Faith							1,000,000
Breach Of The Disputed Debentures And Indentures And Breach Of Fiduciary Obligations							$ 1,800,000
Common stock, shares, issued												6,972,552		6,859,128
Alleged Fee								$ 2,200,000
William Huber [Member]
Contingencies And Guarantees [Line Items]
Breach Of Security Subordination Agreement Amount										$ 3,500,000
Damages For Breach Of Consultancy Agreement										400,000
Damages For Breach Of Consultancy Agreement Plus Certain Warrants										200,000
Damages For Breach Of The Duty Of Good Faith										1,000,000
Breach Of The Disputed Debentures And Indentures And Breach Of Fiduciary Obligations										$ 111,000,000
Maximum [Member]
Contingencies And Guarantees [Line Items]
Total Damages Sought Value									$ 10,000,000
Minimum [Member]
Contingencies And Guarantees [Line Items]
Total Damages Sought Value									$ 1,000,000
Settlement Agreement [Member]
Contingencies And Guarantees [Line Items]
Payments mistakenly		$ 1,700,000	$ 300,000	$ 2,000,000
Claim by prior shareholders of Grow Healthy Holdings LLC [Member]
Contingencies And Guarantees [Line Items]
Loss Contingency Accrual												$ 22,000,000
Counterclaim Against Canaccord [Member]
Contingencies And Guarantees [Line Items]
Payments mistakenly												$ 300,000
Roberts Settlement Agreement [Member]
Contingencies And Guarantees [Line Items]
Loss contingency plaintiffs value	$ 150,000				$ 1,250,000								$ 4,100,000
Simple interest rate													6.00%