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Income taxes - Current Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Income Taxes [Abstract] |  |
Current period income tax | $ 63 | $ 64
Withholding tax | 21 | 66
Total current tax expense | 84 | 130
Origination and reversal of temporary differences | (31,581) | (24,578)
Adjustments for prior periods | (565) | 743
Change in unrecognized deductible temporary differences | 31,846 | 23,835
Total deferred tax expense | (300) | 0
Total income tax expense (recovery) from continuing operations | $ (216) | $ 130

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