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Income taxes - Reconciliation of provision (benefit) for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Income taxes, reconciliation, amount    
Income tax benefit computed at statutory rate $ (21,082) $ (3,041)
Idaho state income tax, net of federal income tax effect $ 619 $ 154
Effective Income Tax Rate Reconciliation, State and Local Jurisdiction, Contribution Greater than 50 Percent, Tax Effect [Extensible Enumeration] IDAHO IDAHO
Foreign tax effects - Canada $ (14) $ (11)
Valuation allowance 22,472 2,272
Share based compensation (1,889) 616
Other 152 7
Other adjustments (258) 3
Total $ 0 $ 0
Tax Jurisdiction of Domicile [Extensible Enumeration] CANADA CANADA
Income taxes, reconciliation, percent    
Income tax benefit computed at statutory rate (21.00%) (21.00%)
Idaho state income tax, net of federal income tax effect 0.60% 1.10%
Foreign tax effects - Canada   (0.10%)
Valuation allowance 22.40% 15.70%
Share based compensation (1.90%) 4.20%
Other 0.20%  
Other adjustments (0.30%)