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Income taxes - Current Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
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