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Share-based compensation - Summary of share options outstanding (Details)
 12 Months Ended
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of options outstanding (in shares) 1,516,641 1,692,347 1,546,700
Weighted average remaining contractual life of options outstanding 7 years 6 months 8 years 4 months 17 days  
Number of options exercisable (in shares) 917,162 943,300  
0.0001 - 1.09      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of options outstanding (in shares) 899,300 1,079,400  
Weighted average remaining contractual life of options outstanding 6 years 3 months 18 days 7 years 8 months 23 days  
Number of options exercisable (in shares) 810,900 934,100  
0.0001 - 1.09 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price range (in cad per share) | $ / shares $ 0.0001 $ 0.0001  
0.0001 - 1.09 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price range (in cad per share) | $ / shares $ 1.09 $ 1.09  
3.09 - 3.43      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of options outstanding (in shares)   23,200  
Weighted average remaining contractual life of options outstanding   8 years 11 months 12 days  
Number of options exercisable (in shares)   9,200  
3.09 - 3.43 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price range (in cad per share) | $ / shares   $ 3.09  
3.09 - 3.43 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price range (in cad per share) | $ / shares   $ 3.43  
8.86 - 11.06      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of options outstanding (in shares) 215,420 181,600  
Weighted average remaining contractual life of options outstanding 9 years 11 months 15 days 11 years 2 months 4 days  
Number of options exercisable (in shares) 36,400 0  
8.86 - 11.06 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price range (in cad per share) | $ / shares $ 8.86 $ 8.86  
8.86 - 11.06 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price range (in cad per share) | $ / shares $ 11.06 $ 11.06  
15.79 - 16.00      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of options outstanding (in shares) 377,089 408,147  
Weighted average remaining contractual life of options outstanding 8 years 9 months 10 days 9 years 9 months 14 days  
Number of options exercisable (in shares) 69,862 0  
15.79 - 16.00 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price range (in cad per share) | $ / shares $ 15.79 $ 15.79  
15.79 - 16.00 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price range (in cad per share) | $ / shares $ 16.00 $ 16.00  
26.43 - 64.19      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of options outstanding (in shares) 24,832 0  
Weighted average remaining contractual life of options outstanding 9 years 10 months 20 days 0 years  
Number of options exercisable (in shares) 0 0  
26.43 - 64.19 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price range (in cad per share) | $ / shares $ 26.43 $ 26.43  
26.43 - 64.19 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price range (in cad per share) | $ / shares $ 64.19 $ 64.19