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Share-based payment arrangements - Summary of share-based payments expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions $ 10,692 $ 10,396
Share options    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions 3,347 3,128
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 1,305 1,600
Restricted share units with performance criteria    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions 2,556 1,195
Deferred units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions 2,270 2,209
Performance share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions $ 1,214 $ 2,264