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Shareholders' capital - Stock Option Activity (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
CAD ($)
$ / shares
shares
Dec. 31, 2022
CAD ($)
$ / shares
shares
Dec. 31, 2021
CAD ($)
$ / shares
shares
Number of awards      
Beginning balance (in shares) | shares 2,626,780 2,040,528  
Granted (in shares) | shares 1,368,744 646,090  
Exercised (in shares) | shares 0 (40,074)  
Forfeited (in shares) | shares (1,327,799) (19,764)  
Ending balance (in shares) | shares 2,667,725 2,626,780 2,040,528
Exercisable (in shares) | shares 2,621,420    
Weighted average exercise price      
Beginning balance (in USD per share) | $ / shares $ 16.02 $ 15.45  
Granted (in USD per share) | $ / shares 10.76 19.11  
Exercised (in USD per share) | $ / shares 0 13.92  
Forfeited (in USD per share) | $ / shares 16.55 19.11  
Ending balance (in USD per share) | $ / shares 14.71 $ 16.02 $ 15.45
Exercisable (in USD per share) | $ / shares $ 17.11    
Weighted average remaining contractual term (years)      
Outstanding shares, weighted average remaining contractual term 5 years 2 months 4 days 5 years 7 months 17 days 6 years 1 month 9 days
Granted, weighted average remaining contractual term 7 years 2 months 26 days 7 years 2 months 19 days  
Exercised, weighted average remaining contractual term   5 years 11 months 12 days  
Beginning balance, aggregate intrinsic value | $ $ 0 $ 3,145  
Granted, aggregate intrinsic value | $ 0 0  
Exercised, aggregate intrinsic value | $ 0 103  
Forfeited, aggregate intrinsic value | $ 0 0  
Ending balance, aggregate intrinsic value | $ $ 0 $ 0 $ 3,145
Exercisable , weighted average remaining contractual term 4 years 6 months    
Exercisable, aggregate intrinsic value | $ $ 0