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Income taxes - Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Abstract]    
Net loss before income taxes (from continuing operations) $ (144,052) $ (160,329)
Expected tax recovery 27.00% 27.00%
Expected tax recovery at 27.00% (2022 – 27.00% ) $ (38,894) $ (43,289)
Non-deductible expenses (non-taxable income) (993) 12,712
Expiry of losses and ITC 96 1,515
Investment tax credits earned (4,009) (3,782)
Foreign tax rate and tax rate differences 4,165 4,636
Change in unrecognized deductible temporary differences 39,674 28,247
Other 119 3
Total income tax expense from continuing operations $ 158 $ 42 [1]
[1] Comparative information has been restated due to a discontinued operation (note 7).