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Share capital, stock options and other stock-based plans - Share units (Details) - Share units - $ / shares
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Number of Units    
Outstanding, beginning of period (in shares) 524,322 478,643
Granted (in shares) 427,691 224,050
Vested and exercised (in shares) (68,071) (90,362)
Forfeited/expired (in shares) (146,457) (54,614)
Outstanding, end of period (in shares) 737,485 557,717
Units outstanding and exercisable, end of period (in shares) 491 0
Weighted average grant date fair value (CDN $)    
Outstanding, beginning of period (in Canadian dollars per share) $ 11.75 $ 15.68
Granted (in Canadian dollars per share) 3.28 8.23
Vested and exercised (in Canadian dollars per share) 17.48 17.58
Forfeited/expired (in Canadian dollars per share) 11.82 22.15
Outstanding, end of period (in Canadian dollars per share) 6.28 11.73
Units outstanding and exercisable, end of period (in Canadian dollars per share) $ 31.07 $ 0