| Summary of Significant Accounting Policies (Tables)
 | 12 Months Ended | 
| Dec. 31, 2021 | 
|---|
| Supplemental Cash Flow Elements [Abstract] |  | 
| Summary of Subsidiaries | The Company’s subsidiaries and its interests in each are presented below as of December 31, 2021: 
|  |  |  |  |  |  |  |  
|  |    |  |    |  |   |  
| MPX Bioceutical ULC (“MPX ULC”)  (1) |  | Canada |  |  | 100 | % |  
|  |  | Luxembourg |  |  | 100 | % |  
|  |  | Arizona, USA |  |  | 100 | % |  
|  |  | Arizona, USA |  |  | 100 | % |  
| Health For Life, Inc.  (1) |  | Arizona, USA |  |  | 100 | % |  
|  |  | Arizona, USA |  |  | 100 | % |  
|  |  | Arizona, USA |  |  | 100 | % |  
| S8 Rental Services, LLC  (1) |  | Arizona, USA |  |  | 100 | % |  
| Soothing Options, Inc.  (1) |  | Arizona, USA |  |  | 100 | % |  
| The Healing Center Wellness Center, Inc. (“THCWC”)  (1) |  | Arizona, USA |  |  | 100 | % |  
|  |  | Colorado, USA |  |  | 100 | % |  
|  |  | Colorado, USA |  |  | 100 | % |  
| iAnthus Capital Management, LLC (“ICM”) |  | Delaware, USA |  |  | 100 | % |  
| GHHIA Management, Inc. (“GHHIA”) |  | Florida, USA |  |  | 100 | % |  
| GrowHealthy Properties, LLC (“GHP”) |  | Florida, USA |  |  | 100 | % |  
| iAnthus Holdings Florida, LLC (“IHF”) |  | Florida, USA |  |  | 100 | % |  
| McCrory’s Sunny Hill Nursery, LLC (“McCrory’s”) |  | Florida, USA |  |  | 100 | % |  
|  |  | Illinois, USA |  |  | 100 | % |  
|  |  | Maryland, USA |  |  | 100 | % |  
| GreenMart of Maryland, LLC  (1) |  | Maryland, USA |  |  | 100 | % |  
| LMS Wellness, Benefit, LLC  (1) |  | Maryland, USA |  |  | 100 | % |  
| Rosebud Organics, Inc.  (1) |  | Maryland, USA |  |  | 100 | % |  
| Cannatech Medicinals, Inc.  (1) |  | Massachusetts, USA |  |  | 100 | % |  
| Fall River Development Company, LLC  (1) |  | Massachusetts, USA |  |  | 100 | % |  
|  |  | Massachusetts, USA |  |  | 100 | % |  
| Mayflower Medicinals, Inc. |  | Massachusetts, USA |  |  | 100 | % |  
| Pilgrim Rock Management, LLC |  | Massachusetts, USA |  |  | 100 | % |  
| CGX Life Sciences, Inc. (“CGX”)  (1) |  | Nevada, USA |  |  | 100 | % |  
|  |  |  |  |  |  |  |  
| GreenMart of Nevada NLV, LLC (GMNV)  (1) |  | Nevada, USA |  |  | 100 | % |  
| iAnthus Northern Nevada, LLC |  | Nevada, USA |  |  | 100 | % |  
|  |  | New Jersey, USA |  |  | 100 | % |  
|  |  | New Jersey, USA |  |  | 100 | % |  
|  |  | New Jersey, USA |  |  | 100 | % |  
| Citiva Medical, LLC (“Citiva”) |  | New York, USA |  |  | 100 | % |  
| iAnthus Empire Holdings, LLC |  | New York, USA |  |  | 100 | % |  
|  |  | Vermont, USA |  |  | 100 | % |  
| Grassroots Vermont Management Services, LLC |  | Vermont, USA |  |  | 100 | % |  
|  |  | Vermont, USA |  |  | 100 | % |  
| (1) | Entities acquired as a part of the MPX Bioceutical Corporation (“MPX”) acquisition on February 5, 2019 (the “MPX Acquisition”). During the year ended December 31, 2020, the Company dissolved  CinG-X  Corporation of America.  |  | 
| Summary of Cash And Cash Equivalents Restricted Cash And Restricted Cash Equivalents | The following table summarizes a reconciliation of cash and restricted cash reported within the consolidated balance sheets to such amounts presented in the statements of cash flows: 
|  |  |  |  |  |  |  |  |  |  
|  |  |  |  |  
|  |  |  |  |  |  |  |  
|  |  | $ | 13,244 |  |  | $ | 11,015 |  |  
|  |  |  | 3,334 |  |  |  | 495 |  |  
|  |  |  |  |  |  |  |  |  |  
| Total cash and restricted cash presented in the statements of cash flows |  |  |  |  |  |  |  |  |  
|  |  |  |  |  |  |  |  |  |  | 
| Summary of Property Plant And Equipment Useful Life | Property, plant and equipment are recorded at historical cost net of accumulated depreciation, write-downs and impairment losses. Depreciation is calculated on a straight-line basis over the estimated useful life as follows: 
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|  |  |  |  |  |  
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|  |  |  |  | over the shorter of the initial term of the underlying lease plus any reasonably assured renewal terms, and the useful life of the asset |  
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|  |  |  |  
|  |  |  |  |  |    
| Office equipment |  | — |  | 3 - 5 years |  
|  |  |  |  
| Land |  | — |  | not depreciated |  | 
| Summary of Effects Of Reclassification Adjustment On The Line Items Of Consolidated Statements Of Operations | The following table summarizes the effects of reclassification adjustment on the line items within the Company’s consolidated statements of operations: 
|  |  |  |  |  |  |  |  
|  |    |  |   |    |  |  
|  |  |  |  |  |  |  |  
| Selling, general and administrative expenses |  | $ | 10,658 |  |  | Depreciation and amortization |  
| Amortization of intangibles |  |  | 15,531 |  |  | Depreciation and amortization |  
| Other losses |  |  | 169 |  |  | Other income |  | 
| Summary of Effects Of Reclassification Adjustment On The Line Items Of Consolidated Statements Of Cashflows | The following table summarizes the effects of reclassification adjustment on the line items within the Company’s consolidated statements of cash flows: 
|  |  |  |  |  |  |  |  
|  |    |  |   |    |  |  
| Change in operating assets and liabilities |    | $ | 3,246 |   |    | Net cash used in investing activities |  | 
| Summary of Effects Of the Adjustment On The Line items Within Consolidated Financial Statements | The following table summarizes the effects of the adjustment on the line items within the Company’s consolidated balance sheet as of December 31, 2020: 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  |  |  |  
|  |  |  |  |  |  |  |  |  |  |  
|  |   | $ | 30,292 |   |   | $ | (4,841 | )  |   | $ | 25,451 |   |  
|  |  |  | 50,464 |  |  |  | (4,841 | ) |  |  | 45,623 |  |  
|  |  |  | 357,974 |  |  |  | (4,841 | ) |  |  | 353,133 |  |  
| Accrued and other current liabilities |  |  | 56,381 |  |  |  | (1,328 | ) |  |  | 55,053 |  |  
|  |  |  | 233,207 |  |  |  | (1,328 | ) |  |  | 231,879 |  |  
|  |  |  | 307,132 |  |  |  | (1,328 | ) |  |  | 305,804 |  |  
|  |  |  | (720,629 | ) |  |  | (3,513 | ) |  |  | (724,142 | ) |  
| Total shareholders’ equity |  |  | 50,842 |  |  |  | (3,513 | ) |  |  | 47,329 |  |  
| Total liabilities and shareholders’ equity |  |  | 357,974 |  |  |  | (4,841 | ) |  |  | 353,133 |  |  The effect of the adjustments on the line items on the Company’s consolidated statement of operations for the year ended December 31, 2020 was as follows: 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  | Year Ended December 31, 2020 |  |  
|  |  |  |  |  |  |  |  |  |  |  
| Costs and expenses applicable to revenues |   | $ | (64,988 | )  |   | $ | (4,841 | )  |   | $ | (69,829 | )  |  
|  |  |  | 86,681 |  |  |  | (4,841 | ) |  |  | 81,840 |  |  
|  |  |  | (245,050 | ) |  |  | (4,841 | ) |  |  | (249,891 | ) |  
| Loss from operations before income tax |  |  | (290,070 | ) |  |  | (4,841 | ) |  |  | (294,911 | ) |  
|  |  |  | 19,961 |  |  |  | (1,328 | ) |  |  | 18,633 |  |  
|  |  |  | (309,849 | ) |  |  | (3,513 | ) |  |  | (313,362 | ) |  
effect of the adjustments on the line items on the Company’s consolidated statement of cash flow for the year ended December 31, 2020 was as follows: 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  |  |  |  
|  |  |  |  |  |  |  |  |  |  |  
|  |  | $ | (309,849 | ) |  | $ | (3,513 | ) |  | $ | (313,362 | ) |  
| 
Change in operating assets and liabilities |  |  | 9,024 |  |  |  | 3,513 |  |  |  | 12,537 |  |  | 
| Summary of Effect Of The Adjsutment On The Line Items Within Inventories | The effect of the adjustment on the line items within the Company’s inventories as of December 31, 2020 was as follows: 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   |    |  |   |  
|   |    |  |   |    |  |   |    |  |   |  
|  |  | $ | 8,457 |  |  | $ | (3,447 | ) |  | $ | 5,010 |  |  
|  |  |  | 8,857 |  |  |  | (1,810 | ) |  |  | 7,047 |  |  
|  |  |  | 5,737 |  |  |  | (27 | ) |  |  | 5,710 |  |  
|  |  |  | 7,241 |  |  |  | 443 |  |  |  | 7,684 |  |  
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