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Income taxes - Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Abstract]    
Net loss before income taxes (from continuing operations) $ (114,613) $ (49,339)
Expected tax recovery at 27.00% (2020 – 27.00%) (30,945) (13,322)
Non-deductible expenses (non-taxable income) 6,330 (3,001)
Expiry of losses and ITC 64 194
Investment tax credits earned (3,677) (3,182)
Foreign tax rate and tax rate differences 3,341 1,668
Change in unrecognized deductible temporary differences 24,651 17,707
Other 20 66
Total income tax expense (recovery) from continuing operations $ (216) $ 130