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Share-based payments - Share options outstanding (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Options
Dec. 31, 2021
Options
$ / shares
Dec. 31, 2019
Options
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding   1,522,362 2,092,596 1,109,943
Weighted average remaining contractual life (years) 7 years 11 months 12 days      
Number of options exercisable     785,413  
Compensation expense | $ $ 7,205 $ 3,018    
Share option        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Compensation expense | $ $ 5,891 $ 3,007    
Exercise Price 2.01 - 4.00        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding     6,300  
Weighted average remaining contractual life (years) 9 months 10 days      
Number of options exercisable     6,300  
Exercise Price 2.01 - 4.00 | Minimum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 2.01  
Exercise Price 2.01 - 4.00 | Maximum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 4.00  
Exercise Price 8.01 - 10.00        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding     452,310  
Weighted average remaining contractual life (years) 6 years 5 months 19 days      
Number of options exercisable     274,745  
Exercise Price 8.01 - 10.00 | Minimum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 8.01  
Exercise Price 8.01 - 10.00 | Maximum        
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     137,890  
Weighted average remaining contractual life (years) 6 years 5 months 1 day      
Number of options exercisable     106,903  
Exercise Price 10.01 - 12.00 | Minimum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 10.01  
Exercise Price 10.01 - 12.00 | Maximum        
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     8,300  
Weighted average remaining contractual life (years) 4 years 7 months 9 days      
Number of options exercisable     8,300  
Exercise Price 12.01 - 14.00 | Minimum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 12.01  
Exercise Price 12.01 - 14.00 | Maximum        
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     289,827  
Weighted average remaining contractual life (years) 7 years 3 months 10 days      
Number of options exercisable     152,353  
Exercise Price 14.01 - 16.00 | Minimum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 14.01  
Exercise Price 14.01 - 16.00 | Maximum        
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     533,155  
Weighted average remaining contractual life (years) 8 years 5 months 1 day      
Number of options exercisable     209,363  
Exercise Price 16.01 - 18.00 | Minimum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 16.01  
Exercise Price 16.01 - 18.00 | Maximum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 18.00  
Exercise Price 20.01 - 22.00        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options outstanding     1,400  
Weighted average remaining contractual life (years) 8 years 7 months 17 days      
Number of options exercisable     464  
Exercise Price 20.01 - 22.00 | Minimum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 20.01  
Exercise Price 20.01 - 22.00 | Maximum        
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     561,514  
Weighted average remaining contractual life (years) 9 years 3 months 7 days      
Number of options exercisable     2,500  
Exercise Price 22.01 - 24.00 | Minimum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 22.01  
Exercise Price 22.01 - 24.00 | Maximum        
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     90,900  
Weighted average remaining contractual life (years) 8 years 11 months 4 days      
Number of options exercisable     24,485  
Exercise Price 24.01 - 26.00 | Minimum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 24.01  
Exercise Price 24.01 - 26.00 | Maximum        
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     11,000  
Weighted average remaining contractual life (years) 9 years 2 months 12 days      
Exercise Price 28.01 - 30.00 | Minimum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 28.01  
Exercise Price 28.01 - 30.00 | Maximum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price | $ / shares     $ 30.00