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Income taxes - Schedule of Reconciliation of Canadian Federal Statutory Income Tax Rates to Effective Tax Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Amount      
Net loss before income taxes $ (177,595) $ (200,395) $ (174,029)
Canadian Federal statutory income tax rate   (54,107) (46,988)
Change due to SR&ED (6,002) (8,224) (7,428)
Change in valuation allowance 12,321 15,205 11,485
Stock-based compensation 11,863    
Other 252 77 (395)
Provincial taxes net of Federal benefit (1,134)    
Income tax recovery $ (31,183) $ (37,538) $ (27,631)
Percent      
Canadian Federal statutory income tax rate   27.00% 27.00%
Change due to SR&ED 3.40%    
Changes in valuation allowance (6.90%)    
Stock-based compensation (6.60%)    
Other (0.10%)    
Provincial taxes net of Federal benefit 0.60%    
Effective tax rate 17.50%    
Canada      
Amount      
Canadian Federal statutory income tax rate $ (44,399)    
Percent      
Canadian Federal statutory income tax rate 25.00%    
United States      
Amount      
Change in valuation allowance $ (2,775)    
Other $ 1,101    
Percent      
Changes in valuation allowance 1.60%    
Other (0.60%)    
Other Foreign Jurisdictions      
Amount      
Change in valuation allowance and other $ (2,410)    
Percent      
Change in valuation allowance and other 1.20%