Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Subsidiaries (Detail)

v3.22.0.1
Summary of Significant Accounting Policies - Summary of Subsidiaries (Detail) - Subsidiaries [Member]
 12 Months Ended
Dec. 31, 2021
MPX Bioceutical ULC ("MPX ULC")  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity MPX Bioceutical ULC (“MPX ULC”) [1]
Place of Incorporation Canada [1]
Interest 100.00% [1]
MPX Luxembourg SARL  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity MPX Luxembourg SARL [1]
Place of Incorporation Luxembourg [1]
Interest 100.00% [1]
ABACA, Inc.  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity ABACA, Inc. [1]
Place of Incorporation Arizona, USA [1]
Interest 100.00% [1]
Ambary, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Ambary, LLC [1]
Place of Incorporation Arizona, USA [1]
Interest 100.00% [1]
Health For Life, Inc.  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Health For Life, Inc. [1]
Place of Incorporation Arizona, USA [1]
Interest 100.00% [1]
Anthus Arizona, LLC iA AZ [Member]  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity iAnthus Arizona, LLC (“iA AZ”)
Place of Incorporation Arizona, USA
Interest 100.00%
S8 Management, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity S8 Management, LLC [1]
Place of Incorporation Arizona, USA [1]
Interest 100.00% [1]
S8 Rental Services, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity S8 Rental Services, LLC [1]
Place of Incorporation Arizona, USA [1]
Interest 100.00% [1]
Soothing Options, Inc.  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Soothing Options, Inc. [1]
Place of Incorporation Arizona, USA [1]
Interest 100.00% [1]
The Healing Center Wellness Center, Inc. THCWC [Member]  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity The Healing Center Wellness Center, Inc. (“THCWC”) [1]
Place of Incorporation Arizona, USA [1]
Interest 100.00%
Bergamot Properties, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Bergamot Properties, LLC
Place of Incorporation Colorado, USA
Interest 100.00%
Scarlet Globemallow, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Scarlet Globemallow, LLC
Place of Incorporation Colorado, USA
Interest 100.00%
iAnthus Capital Management, LLC ("ICM")  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity iAnthus Capital Management, LLC (“ICM”)
Place of Incorporation Delaware, USA
Interest 100.00%
GHHIA Management, Inc. ("GHHIA")  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity GHHIA Management, Inc. (“GHHIA”)
Place of Incorporation Florida, USA
Interest 100.00%
GrowHealthy Properties, LLC ("GHP")  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity GrowHealthy Properties, LLC (“GHP”)
Place of Incorporation Florida, USA
Interest 100.00%
iAnthus Holdings Florida, LLC ("IHF")  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity iAnthus Holdings Florida, LLC (“IHF”)
Place of Incorporation Florida, USA
Interest 100.00%
McCrory's Sunny Hill Nursery, LLC ("McCrory's")  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity McCrory’s Sunny Hill Nursery, LLC (“McCrory’s”)
Place of Incorporation Florida, USA
Interest 100.00%
iA IT, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity iA IT, LLC
Place of Incorporation Illinois, USA
Interest 100.00%
Budding Rose, Inc.  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Budding Rose, Inc. [1]
Place of Incorporation Maryland, USA [1]
Interest 100.00% [1]
GreenMart of Maryland, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity GreenMart of Maryland, LLC [1]
Place of Incorporation Maryland, USA [1]
Interest 100.00% [1]
LMS Wellness, Benefit, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity LMS Wellness, Benefit, LLC [1]
Place of Incorporation Maryland, USA [1]
Interest 100.00% [1]
Rosebud Organics, Inc.  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Rosebud Organics, Inc. [1]
Place of Incorporation Maryland, USA [1]
Interest 100.00% [1]
Cannatech Medicinals, Inc.  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Cannatech Medicinals, Inc. [1]
Place of Incorporation Massachusetts, USA [1]
Interest 100.00% [1]
Fall River Development Company, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Fall River Development Company, LLC [1]
Place of Incorporation Massachusetts, USA [1]
Interest 100.00% [1]
IMT, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity IMT, LLC [1]
Place of Incorporation Massachusetts, USA [1]
Interest 100.00% [1]
Mayflower Medicinals, Inc.  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Mayflower Medicinals, Inc.
Place of Incorporation Massachusetts, USA
Interest 100.00%
Pilgrim Rock Management, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Pilgrim Rock Management, LLC
Place of Incorporation Massachusetts, USA
Interest 100.00%
CGX Life Sciences, Inc. ("CGX")  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity CGX Life Sciences, Inc. (“CGX”) [1]
Place of Incorporation Nevada, USA [1]
Interest 100.00% [1]
GreenMart of Nevada NLV, LLC (GMNV)  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity GreenMart of Nevada NLV, LLC (GMNV) [1]
Place of Incorporation Nevada, USA [1]
Interest 100.00% [1]
iAnthus Northern Nevada, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity iAnthus Northern Nevada, LLC
Place of Incorporation Nevada, USA
Interest 100.00%
GTL Holdings, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity GTL Holdings, LLC
Place of Incorporation New Jersey, USA
Interest 100.00%
iA CBD, LLC ("iA CBD")  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity iA CBD, LLC (“iA CBD”)
Place of Incorporation New Jersey, USA
Interest 100.00%
iAnthus New Jersey LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity iAnthus New Jersey, LLC
Place of Incorporation New Jersey, USA
Interest 100.00%
Citiva Medical, LLC ("Citiva")  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Citiva Medical, LLC (“Citiva”)
Place of Incorporation New York, USA
Interest 100.00%
iAnthus Empire Holdings, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity iAnthus Empire Holdings, LLC
Place of Incorporation New York, USA
Interest 100.00%
FWR, Inc.  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity FWR, Inc.
Place of Incorporation Vermont, USA
Interest 100.00%
Grassroots Vermont Management Services, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Grassroots Vermont Management Services, LLC
Place of Incorporation Vermont, USA
Interest 100.00%
Pakalolo, LLC  
DisclosureOfSubsidiaries [Line Items]  
Name of Entity Pakalolo, LLC
Place of Incorporation Vermont, USA
Interest 100.00%
[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 America.