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Deferred tax assets and liabilities - Components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets $ 280 $ 1,403    
Deferred tax liabilities 0 0    
NET 280 1,403 $ 1,546 $ 1,357
Employee benefits        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets 44 25    
Deferred tax liabilities 0 0    
NET 44 25 23 29
Unused tax losses & tax credits        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets 42,178 60,308    
Deferred tax liabilities 0 0    
NET 42,178 60,308 66,304 27,650
Unremitted earnings        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets 0 0    
Deferred tax liabilities (41,942) (58,930)    
NET (41,942) (58,930) $ (64,781) $ (26,322)
Before offset amount        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets 42,222 60,333    
Deferred tax liabilities (41,942) (58,930)    
NET 280 1,403    
Offset        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets 41,942 58,930    
Deferred tax liabilities $ (41,942) $ (58,930)