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Deferred tax assets and liabilities - Unrecognized deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized tax losses $ 114,300 $ 120,100
Unused tax losses for which no deferred tax asset recognised 48,600 48,600
Unrecognized deferred tax assets 16,407 17,875
Unrecognized deferred tax liabilities 0 0
Deductible temporary differences    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deferred tax assets 270 261
Unrecognized deferred tax liabilities 0 0
Taxable temporary differences    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deferred tax assets 0 0
Unrecognized deferred tax liabilities (12,162) (12,162)
Unused tax losses & tax credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deferred tax assets 28,299 29,776
Unrecognized deferred tax liabilities 0 0
Before offset amount    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deferred tax assets 28,569 30,037
Unrecognized deferred tax liabilities (12,162) (12,162)
Offset    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deferred tax assets 12,162 12,162
Unrecognized deferred tax liabilities $ (12,162) $ (12,162)