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Share-based payments - MIP II (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
EquityInstruments
Dec. 31, 2021
USD ($)
EquityInstruments
Dec. 31, 2020
USD ($)
EquityInstruments
Share-based payments      
Expense arising from equity-settled share-based payments transactions $ 5,074 $ 4,410 $ 3,519
MIP II      
Share-based payments      
Granted | EquityInstruments 13,536,960    
Vesting period 5 years    
Extension of vesting period 5 years    
Carrying amount of the liability $ 1,562 5,927  
Expense arising from equity-settled share-based payments transactions $ 4,365    
Compensation (benefit) recorded in the consolidated statement of operations   $ (2,984) $ 5,457
Exercised during the year (shares) | EquityInstruments 0 0 0