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General and administrative - Schedule of general and administrative expense (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Selling, general and administrative expense [abstract]      
Professional fees $ 6,256,165 $ 2,734,123 $ 3,101,136
General office, insurance and administration expenditures 3,479,801 3,616,159 1,742,550
Consulting fees 2,196,812 1,775,269 1,675,258
Salaries, wages and benefits 2,856,887 2,656,162 1,705,696
Investor relations 1,642,653 541,944 2,241,275
Building and facility costs 759,590 586,926 676,798
Foreign exchange gain (loss) 146,587 (186,959) 0
General and administrative 17,338,495 11,723,624 11,142,713
Allocated to:      
Continuing operations 15,926,103 10,058,083 8,407,427
Discontinued operations $ 1,412,392 $ 1,665,541 $ 2,735,286