Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Detail)

v3.22.0.1
Subsequent Events - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Jan. 07, 2022
Oct. 24, 2019
MPX NJ [Member]        
Equity Method Investment, Ownership Percentage 99.00%      
iAnthus New Jersey LLC | MPX NJ [Member]        
Equity Method Investment, Ownership Percentage     1.00% 99.00%
iAnthus New Jersey LLC | Maximum [Member] | MPX NJ [Member]        
Equity Method Investment, Ownership Percentage     100.00%  
MPX New Jersey LLC [Member]        
Percentage of voting equity interests acquired     100.00%  
Recapitalization | Selling, general and administrative expenses        
Restructuring costs incurred $ 7.4 $ 6.8    
Restructuring costs incurred to date $ 14.2