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Share-based Payments - Summary of Restricted Share Units Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of warrants      
Exercised (in shares) (2,131,939) (282,572)  
Weighted average grant date fair value (C$)      
Exercised (in dollars per share) $ 2.03 $ 3.48  
Restricted share units      
Number of warrants      
Balance at beginning of period (in shares) 732,972 0  
Granted (in shares) 957,854 732,972 0
Exercised (in shares) (732,972)    
Cancellation and forfeitures (in shares) (9,497)    
Balance at end of period (in shares) 948,357 732,972 0
Weighted average grant date fair value (C$)      
Balance at beginning of period (in dollars per share) $ 15.34 $ 0  
Granted (in dollars per share) 7.66 15.34  
Exercised (in dollars per share) 15.34    
Cancellation and forfeitures (in dollars per share) 7.52    
Balance at end of period (in dollars per share) $ 7.66 $ 15.34 $ 0