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Income taxes - Current Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Abstract]    
Current period income tax $ 64 $ 39
Withholding tax 94 3
Total current tax expense 158 42
Origination and reversal of temporary differences (45,050) (12,264)
Adjustments for prior periods 2,174 277
Change in unrecognized deductible temporary differences 42,876 11,987
Total deferred tax expense 0 0
Total income tax expense from continuing operations $ 158 $ 42 [1]
[1] Comparative information has been restated due to a discontinued operation (note 7).