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Share-based compensation - Changes in stock options (Details)
1 Months Ended 12 Months Ended
Aug. 14, 2019
shares
Jul. 08, 2019
shares
Jun. 10, 2019
shares
May 13, 2019
shares
Dec. 31, 2020
shares
$ / shares
Nov. 30, 2020
shares
Aug. 31, 2020
shares
Jun. 30, 2020
shares
Mar. 31, 2020
shares
Feb. 29, 2020
shares
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Share-Based Payment Arrangements [Abstract]                        
Number of options outstanding - beginning of period (in shares) | shares                     1,692,347 1,546,700
Number of options granted (in shares) | shares                     65,050 601,347
Number of options forfeited (in shares) | shares                     (48,325) (21,000)
Number of options exercised (in shares) | shares (6,900) (34,800) (6,900) (386,100) (32,052) (3,277) (90,000) (50,000) (13,800) (2,300) (192,431) (434,700)
Number of options outstanding - end of period (in shares) | shares         1,516,641           1,516,641 1,692,347
Number of options exercisable (in shares) | shares         917,162           917,162 943,300
Weighted average exercise price, options outstanding - beginning of period (in cad per share) | $ / shares                     $ 5.41 $ 0.98
Weighted average exercise price, options granted (in cad per share) | $ / shares                     29.04 13.59
Weighted average exercise price, options forfeited (in cad per share) | $ / shares                     10.19 2.14
Weighted average exercise price, options exercised (in cad per share) | $ / shares                     1.77 1.13
Weighted average exercise price, options outstanding - end of period (in cad per share) | $ / shares         $ 6.73           6.73 5.41
Weighted average exercise price, options exercisable (in cad per share) | $ / shares         $ 2.38           $ 2.38 $ 0.99