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Share-based compensation - Schedule of share-based compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation expenses $ 7,443,930 $ 8,052,011 $ 12,082,930
Stock options      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation expenses 3,594,005 2,825,863 10,780,853
Warrants      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation expenses 98,513 0 0
Class B Common Shares issued for services      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation expenses 174,537 0 0
Class B Common Shares issued for compensation      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation expenses $ 3,576,875 $ 5,226,148 $ 1,302,077