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Share-based compensation - Changes in stock options (Details)
 9 Months Ended
Sep. 30, 2022
shares
$ / shares
Sep. 30, 2021
shares
$ / shares
Share-Based Payment Arrangements [Abstract]    
Number of options outstanding - beginning of period (in shares) | shares 1,283,088 1,516,641
Number of options granted (in shares) | shares 168,588 115,969
Number of options forfeited (in shares) | shares (63,415) (28,736)
Number of options exercised (in shares) | shares (9,179) (147,025)
Number of options outstanding - end of period (in shares) | shares 1,379,082 1,456,849
Number of options exercisable (in shares) | shares 887,779 814,367
Weighted average exercise price, options outstanding - beginning of period (in cad per share) | $ / shares $ 12.00 $ 6.73
Weighted average exercise price, options granted (in cad per share) | $ / shares 44.91 53.19
Weighted average exercise price, options forfeited (in cad per share) | $ / shares 46.41 14.84
Weighted average exercise price, options exercised (in cad per share) | $ / shares 14.52 3.37
Weighted average exercise price, options outstanding - end of period (in cad per share) | $ / shares 14.42 10.61
Weighted average exercise price, options exercisable (in cad per share) | $ / shares $ 4.06 $ 2.54