Quarterly report [Sections 13 or 15(d)]

Long-Term Debt - Additional Information (Detail)

v3.25.2
Long-Term Debt - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 16, 2024
USD ($)
Days
Feb. 02, 2023
USD ($)
Jun. 24, 2022
USD ($)
Feb. 02, 2021
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Debt Instrument [Line Items]                  
Debt instrument, issuance costs, net         $ 21,900   $ 21,900   $ 21,900
Debt instrument, unamortized discount costs         9,000   9,000   11,400
Debt instrument, loss on extinguishment of debt         0 $ 0 0 $ (114)  
Interest expense             8,283 8,393  
Accretion expense         1,212 1,165 2,401 2,237  
Long term debt, fair value         $ 178,875   $ 178,875   170,148
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         $ 2,600 2,300 $ 5,000 4,600  
Accretion expense         700 800 1,500 1,500  
Long term debt, fair value     $ 84,500   144,499   144,499   134,096
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         500 400 1,000 900  
Accretion expense         200 300 500 500  
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 1,200 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         900   $ 900   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.    
iAnthus New Jersey LLC [Member] | June Unsecured Debentures [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, first quarterly payment date     Jun. 30, 2022            
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%            
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, interest rate stated percentage   12.00%              
Debt instrument, percentage of total outstanding debt instrument principal amount   10.00%              
Interest expense         400 400 $ 800 900  
Accretion expense         200 200 400 300  
Long term debt, fair value $ 14,300                
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] | iAnthus New Jersey LLC [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, face value $ 1,600                
Non-Operational Cash Receipts             4,100   $ 0
Debt instrument, interest rate stated percentage 12.00%                
Debt instrument, percentage of total outstanding debt instrument principal amount 10.00%                
Debt instrument, maturity date, range start Feb. 16, 2024                
Debt instrument, maturity date, range end Feb. 16, 2026                
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                
Debt instrument, loss on extinguishment of debt         $ 0 $ 0 $ 0 $ 100