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Income taxes - Current Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Current tax expense    
Current period income tax $ 121 $ 64
Withholding tax 0 94
Total current tax expense 121 158
Deferred tax expense    
Origination and reversal of temporary differences (14,279) (45,050)
Adjustments for prior periods 1,648 2,174
Change in unrecognized deductible temporary differences 12,631 42,876
Total deferred tax expense 0 0
Total income tax expense from continuing operations $ 121 $ 158