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Share-based payment arrangements - Summary of movements in number of share options outstanding and weighted average exercise prices (Details)
 12 Months Ended
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Weighted average exercise price Cdn$    
Weighted average exercise price, At January 1, | $ / shares $ 14.08 $ 22.56
Weighted average exercise price, Granted | $ / shares 12.72 5.98
Weighted average exercise price, Exercised | $ / shares 7.75 6.20
Weighted average exercise price, Expired | $ / shares 33.40 38.96
Weighted average exercise price, Forfeited | $ / shares 12.53 21.48
Weighted average exercise price, At December 31, | $ / shares $ 11.56 $ 14.08
Number of options    
Number of options, At January 1, | shares 5,714,491 5,591,228
Number of options, Granted | shares 1,156,744 2,387,256
Number of options, Exercised | shares (618,915) (56,644)
Number of options, Expired | shares (813,933) (697,322)
Number of options, Forfeited | shares (345,999) (1,510,027)
Number of options, At December 31, | shares 5,092,388 5,714,491