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Deferred tax assets and liabilities - Movement of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance $ 1,403 $ 1,546 $ 1,357
Recognized in income (1,128) (1,124) 197
Recognized in equity 0 0 0
Other movements 0 991 0
Translation Differences 5 (10) (8)
Ending balance 280 1,403 1,546
Employee benefits      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance 25 23 29
Recognized in income 18 4 (4)
Recognized in equity 0 0 0
Other movements 0 0 0
Translation Differences 1 (2) (2)
Ending balance 44 25 23
Unused tax losses & tax credits      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance 60,308 66,304 27,650
Recognized in income (18,134) (5,988) 38,660
Recognized in equity 0 0 0
Other movements 0 0 0
Translation Differences 4 (8) (6)
Ending balance 42,178 60,308 66,304
Unremitted earnings      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance (58,930) (64,781) (26,322)
Recognized in income 16,988 5,851 (38,459)
Recognized in equity 0 0 0
Other movements 0 0 0
Translation Differences 0 0 0
Ending balance (41,942) (58,930) (64,781)
Reclassification      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance $ 0 0  
Recognized in income   (991)  
Recognized in equity    
Other movements   991  
Translation Differences   0  
Ending balance   $ 0 $ 0