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Income taxes - Components of income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Abstract]    
Current tax (recovery) expense $ (53) $ 642
Deferred tax (recovery) expense 389 (33)
Total tax expense (income) 336 609
Income tax payable $ 66 $ 412