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Share-based payment arrangements - Summary of share-based payments expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions $ 7,945 $ 10,692
Share options    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions 2,806 3,347
Restricted share units with no performance criteria    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions 1,291 1,305
Restricted share units with performance criteria    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions 3,462 2,556
Deferred units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions (516) 2,270
Performance share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions $ 902 $ 1,214