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Share-based Payments - Summary of Deferred Share Units Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial liability      
Granting and vesting of DSUs $ 15,361 $ 11,619 $ 8,151
Deferred Share Units (DSUs)      
Number of warrants      
Balance at beginning of period (in shares) 33,397 0  
Granting and vesting of DSUs (in shares) 58,380 33,397  
Liabilities settled (in shares) (8,484)    
Balance at end of period (in shares) 83,293 33,397 0
Financial liability      
Balance at beginning of period $ 255 $ 0  
Granting and vesting of DSUs 338 452  
Liabilities settled (46)    
Loss (gain) on revaluation 30 (197)  
Balance at end of period $ 577 $ 255 $ 0