Quarterly report [Sections 13 or 15(d)]

Long-Term Debt - Additional Information (Detail)

v3.26.1
Long-Term Debt - Additional Information (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended
Feb. 16, 2026
USD ($)
Feb. 16, 2024
USD ($)
Days
Feb. 02, 2023
USD ($)
Jun. 24, 2022
USD ($)
Feb. 02, 2021
USD ($)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Debt Instrument [Line Items]                
Debt instrument, issuance costs, net           $ 22,000   $ 21,900
Debt instrument, unamortized discount costs           5,600   6,500
Interest expense           4,144 $ 4,212  
Accretion expense           1,131 1,189  
Long term debt, fair value           $ 192,329   186,489
Other Equity Method Investees [Member]                
Debt Instrument [Line Items]                
Company's acquisition equity interests           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 2,400  
Accretion expense           800 800  
Long term debt, fair value       $ 84,500   159,471   154,569
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           500 500  
Accretion expense           300 300  
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           700 600  
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, accrued interest           $ 300   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, threshold limit of qualified financing, net proceeds not less than the subscription of securities           $ 10,000    
Debt instrument, interest rate stated percentage     12.00%          
Debt instrument, percentage of total outstanding debt instrument principal amount     10.00%          
Interest expense           300 400  
Accretion expense           100 $ 200  
Long term debt, fair value   $ 8,200            
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]                
Debt Instrument [Line Items]                
Debt instrument, maturity date Feb. 16, 2026              
Debt instrument, maturity date, range end Jun. 24, 2027              
Debt Instrument, Issuance Date Feb. 02, 2021              
Aggregate initial principal amount $ 11,000              
Debt instrument, redemption price, percentage of principal amount redeemed 2.00%              
Aggregate Principal Amount Outstanding $ 8,400              
Reduction to Carrying Amount           200    
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            
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            
Non Operational Cash Receipts           $ 100   $ 7,400
Debt instrument, non-operational cash receipts, utilization rate   25.00%            
Debt instrument, payment towards outstanding principal amount   $ 5,000