Quarterly report pursuant to Section 13 or 15(d)

Unaudited Interim Condensed Consolidated Statements of Cash Flows Supplemental Information - Summary of Significant Non-Cash Investing and Financing Activities (Detail)

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Unaudited Interim Condensed Consolidated Statements of Cash Flows Supplemental Information - Summary of Significant Non-Cash Investing and Financing Activities (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash Flow Non Cash Investing And Financing Activities Disclosure [Line Items]    
Share issuance - settlement of outstanding obligations $ 0 $ 193
Secured Debt [Member] | Tranche Four Secured Notes [Member]    
Cash Flow Non Cash Investing And Financing Activities Disclosure [Line Items]    
Non-cash consideration transferred 947 259
iAnthus New Jersey, LLC Senior Secured Bridge Notes [Member] | iAnthus New Jersey, LLC [Member]    
Cash Flow Non Cash Investing And Financing Activities Disclosure [Line Items]    
Non-cash consideration transferred 1,049 0
MPX Warrants [Member]    
Cash Flow Non Cash Investing And Financing Activities Disclosure [Line Items]    
Cashless exercise of MPX warrants recorded as derivatives $ 0 $ 3,325