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Share-based payment arrangements - Summary of Share-based Payments Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions with employees $ 10,396 $ 6,989
Share options    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions with employees 3,128 3,392
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 with employees 1,600 1,425
Restricted share units with performance criteria    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions with employees 1,195 175
Deferred units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions with employees 2,209 (277)
Performance share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions with employees $ 2,264 $ 2,274