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Related party transactions - Schedule of key management personnel compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [abstract]      
Salaries, benefits, bonuses and consulting fees $ 2,075,893 $ 2,936,816 $ 3,638,267
Share-based payments 6,881,641 7,045,994 9,385,984
Total $ 8,957,534 $ 9,982,810 $ 13,024,251