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Share-based Payments - Summary of the Changes in Options (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2020
$ / shares
$ / shares
shares
Jun. 30, 2019
$ / shares
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Weighted average exercise price (C$)        
Balance at beginning of period (in dollars per share) | $ / shares $ 4.84 $ 2.99 $ 2.99  
Issuance of options (in dollars per share) | $ / shares   20.81    
Exercise of options (in dollars per share) | $ / shares 2.05 3.76    
Cancellation, forfeiture and expiry of options (in dollars per share) | $ / shares 15.78 1.63    
Balance at end of period (in dollars per share) | $ / shares $ 5.13 $ 4.66 $ 4.84 $ 2.99
Weighted average exercise price of options exercisable (in dollars per share) | $ / shares $ 3.42 $ 2.40    
Number of options        
Balance at beginning of period (in shares) | shares 14,149,502 12,902,995 12,902,995  
Issuance of options (in shares) | shares   1,315,787    
Exercise of options (in shares) | shares (1,807,909) (227,342)    
Cancellation, forfeiture and expiry of options (in shares) | shares (127,045) (2,895)    
Balance at end of period (in shares) | shares 12,214,548 13,988,545 14,149,502 12,902,995
Exercisable (in shares) | shares 8,688,645 6,580,238    
Weighted average remaining contractual term (years)        
Outstanding 2 years 18 days 3 years 14 days 2 years 6 months 21 days 3 years 4 months 6 days
Exercisable 1 year 9 months 10 days 2 years 8 months 8 days