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Income taxes - Current Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Income Taxes [Abstract] |  |
Current period income tax | $ 39 | $ 63
Withholding tax | 3 | 21
Total current tax expense | 42 | 84
Origination and reversal of temporary differences | (18,849) | (31,581)
Adjustments for prior periods | 304 | (565)
Change in unrecognized deductible temporary differences | 14,967 | 31,846
Total deferred tax expense | (3,578) | (300)
Total income tax expense (recovery) from continuing operations | $ (3,536) | $ (216)

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