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Share-based payment arrangements - Additional information (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
shares
tranche
$ / shares
Dec. 31, 2019
CAD ($)
shares
$ / shares
Dec. 31, 2020
CAD ($)
shares
$ / shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of share options granted (in shares) 1,156,744 2,387,256        
Employee stock option plan            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Term of employee option plan 5 years          
Number of tranches | tranche 3          
Vesting percentage on first anniversary 33.33%          
Vesting percentage on second anniversary 33.33%          
Vesting percentage on third anniversary 33.33%          
Number of share options available to grant under the plan (in shares) 3,898,038 3,748,454        
Number of share purchase options available to grant (in shares) 2,416,611 2,670,039        
Weighted average exercise price of share purchase options vested and exercisable (in Cdn$ per share) | $ / shares   $ 21.87 $ 14.45      
Weighted average share price at date of options exercised (in Cdn$ per share) | $ / shares   $ 10.43 $ 14.47      
Weighted average fair value per stock option (in Cdn$ per share) | $   $ 2.19 $ 4.12      
Restricted share unit plan            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Maximum number of shares reserved for issue under options     5,000,000 5,000,000    
Number of shares purchased on open market 385,000          
Payments for shares purchased on open market | $ $ 3,550          
Number of share purchased held in trust share-based payment arrangement (in shares) 564,586          
Number of share options granted in share-based payment arrangement (in shares) 149,552          
Weighted average fair value per stock option (in Cdn$ per share) | $     $ 12.90      
Number of share purchase options vested and exercisable (in shares)   29,111 44,748 44,748 29,111  
Restricted Shares With Performance Criteria            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Term of employee option plan 3 years          
Number of share options granted in share-based payment arrangement (in shares) 299,112 412,473        
Weighted average exercise price of other equity instruments granted in share-based payment arrangement (in $Cdn per share) | $ / shares $ 24.94          
Number of shares outstanding   457,498 689,967 689,967 457,498 152,927
Restricted Shares With Performance Criteria | Bottom of range            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Performance target award (range) 0.00%          
Restricted Shares With Performance Criteria | Top of range            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Performance target award (range) 200.00%          
Deferred Share Units Plans            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of shares outstanding   362,433 289,360 289,360 362,433  
Liabilities from share-based payment transactions | $       $ 3,834 $ 2,911  
Performance share unit            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Maximum number of shares reserved for issue under options     100,395 100,395    
Number of share options granted in share-based payment arrangement (in shares) 0 264,083        
Number of shares outstanding   610,885 525,605 525,605 610,885 484,899
Performance share unit | Bottom of range            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Performance target award (range) 0.00%          
Performance share unit | Top of range            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Performance target award (range) 200.00%          
Restricted share units with no performance criteria            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Vesting percentage on first anniversary 33.33%          
Vesting percentage on second anniversary 33.33%          
Vesting percentage on third anniversary 33.33%          
Number of share options granted in share-based payment arrangement (in shares) 149,552 391,092        
Number of shares outstanding   536,330 478,067 478,067 536,330 333,119