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Share-based payments - Share options outstanding (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Options
Dec. 31, 2023
Options
$ / shares
Dec. 31, 2021
Options
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding   1,511,773 1,474,809 2,092,596
Weighted average remaining contractual life (years) 6 years 29 days      
Number of options exercisable     1,218,581  
Compensation expense | $ $ 3,417 $ 4,238    
Share option        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Compensation expense | $ $ 1,211 $ 2,514    
Exercise Price 8.01 - 10.00        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding     317,609  
Weighted average remaining contractual life (years) 5 years 3 months 18 days      
Number of options exercisable     314,535  
Exercise Price 8.01 - 10.00 | Bottom of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 8.01  
Exercise Price 8.01 - 10.00 | Top of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 10.00  
Exercise Price 10.01 - 12.00        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding     109,534  
Weighted average remaining contractual life (years) 4 years 2 months 23 days      
Number of options exercisable     109,534  
Exercise Price 10.01 - 12.00 | Bottom of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 10.01  
Exercise Price 10.01 - 12.00 | Top of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 12.00  
Exercise Price 12.01 - 14.00        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding     37,650  
Weighted average remaining contractual life (years) 8 years 7 days      
Number of options exercisable     9,050  
Exercise Price 12.01 - 14.00 | Bottom of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 12.01  
Exercise Price 12.01 - 14.00 | Top of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 14.00  
Exercise Price 14.01 - 16.00        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding     142,456  
Weighted average remaining contractual life (years) 3 years 5 months 4 days      
Number of options exercisable     133,759  
Exercise Price 14.01 - 16.00 | Bottom of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 14.01  
Exercise Price 14.01 - 16.00 | Top of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 16.00  
Exercise Price 16.01 - 18.00        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding     421,889  
Weighted average remaining contractual life (years) 6 years 4 months 24 days      
Number of options exercisable     376,252  
Exercise Price 16.01 - 18.00 | Bottom of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 16.01  
Exercise Price 16.01 - 18.00 | Top of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 18.00  
Exercise Price 18.01 - 20.00        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding     21,700  
Weighted average remaining contractual life (years) 9 years 5 months 12 days      
Exercise Price 18.01 - 20.00 | Bottom of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 18.01  
Exercise Price 18.01 - 20.00 | Top of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 20.00  
Exercise Price 20.01 - 22.00        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding     300  
Weighted average remaining contractual life (years) 6 years 7 months 17 days      
Number of options exercisable     248  
Exercise Price 20.01 - 22.00 | Bottom of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 20.01  
Exercise Price 20.01 - 22.00 | Top of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 22.00  
Exercise Price 22.01 - 24.00        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding     411,871  
Weighted average remaining contractual life (years) 7 years 4 months 17 days      
Number of options exercisable     266,951  
Exercise Price 22.01 - 24.00 | Bottom of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 22.01  
Exercise Price 22.01 - 24.00 | Top of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 24.00  
Exercise Price 24.01 - 26.00        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding     1,800  
Weighted average remaining contractual life (years) 6 years 10 months 24 days      
Number of options exercisable     1,373  
Exercise Price 24.01 - 26.00 | Bottom of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 24.01  
Exercise Price 24.01 - 26.00 | Top of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 26.00  
Exercise Price 28.01 - 30.00        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding     10,000  
Weighted average remaining contractual life (years) 7 years 2 months 12 days      
Number of options exercisable     6,879  
Exercise Price 28.01 - 30.00 | Bottom of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 28.01  
Exercise Price 28.01 - 30.00 | Top of range        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 30.00