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Share-based compensation (Narrative) (Details)
12 Months Ended
Dec. 31, 2021
$ / shares
Dec. 31, 2021
USD ($)
Share
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Share
Dec. 31, 2019
$ / shares
Dec. 31, 2019
USD ($)
Share
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]            
Number of share options expired   953,803        
Number of share options cancelled   307,987   822,137   299,006
Number of share options issued   2,841,086   1,082,639   1,363,322
Share option exercise price | $ / shares $ 2.26   $ 4.14   $ 20.68  
Expected volatility, share options granted       120.00%   100.00%
Share-based compensation expenses | $   $ 3,594,005   $ 2,825,863   $ 10,780,853
Replacement share options            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of share options cancelled       822,137    
Number of share options issued       822,137    
Share option exercise price | $ / shares     $ 3.86      
Incremental grant date fair value of share options | $     $ 661,811 $ 661,811    
Exercise price | $ / shares     $ 3.86      
Underlying share price | $ / shares     $ 3.86      
Risk free interest rate       0.72%    
Expected volatility, share options granted       120.00%