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Assets held for sale - Schedule of net loss and comprehensive loss from discontinued operations (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Expenses      
General and administrative $ 15,926,103 $ 10,058,083 $ 8,407,427
Depreciation and amortization 4,045,523 3,900,458 1,943,048
Other income (1,292) (3,691) (40,454)
Net loss from discontinued operations (1,347,473) (3,347,561) (5,048,557)
Cobourg facility      
Disclosure Of Assets Held For Sale [Line Items]      
Revenue 0 14,514 193,416
Cost of revenue 0 1,032,010 1,473,839
Gross loss before fair value adjustments 0 (1,017,496) (1,280,423)
Fair value adjustments on inventory sold 0 (945) 16,738
Unrealized loss on changes in fair value of biological assets 0 166,886 513,625
Gross loss (0) (1,183,437) (1,810,786)
Expenses      
General and administrative 1,412,392 1,665,541 2,735,286
Depreciation and amortization 0 90,340 424,199
Impairment of equipment 0 387,474 132,273
Total operating expenses 1,412,392 2,143,355 3,291,758
Loss from discontinued operations (1,412,392) (3,326,792) (5,102,544)
Other income (64,919) (79,568) (53,987)
Loss on sale of equipment 0 100,337 0
Net loss from discontinued operations $ (1,347,473) $ (3,347,561) $ (5,048,557)