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Income taxes - Additional information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Income taxes    
Income tax benefit (provision) $ 0.0 $ 0.0
Allowance balance related to future tax benefits $ 5.4  
Percentage of operating loss carryforwards - U.S 25.19%  
Percentage of operating loss carryforwards - Canada 27.00%  
Income tax payments $ 0.0 0.0
Unrecognized tax benefits $ 0.0 $ 0.0
Income tax examination, description U.S. tax returns for the years 2022 to 2024 and Canadian tax returns for the years 2022 to 2024 remain subject to examination but there are currently no ongoing exams in any taxing jurisdictions. Tax returns for years prior to 2022 may remain open with respect to net operating loss carryforwards that are utilized in a later year, as tax attributes from prior years can be adjusted during an audit of a later year.  
State and local jurisdiction    
Income taxes    
Net operating loss carry forwards $ 134.9  
United States    
Income taxes    
Net operating loss carry forwards 70.1  
Operating loss carry forwards not subject to expiration $ 112.6  
Percentage of limitation of loss carry forward utilization 80.00%  
Canada    
Income taxes    
Net operating loss carry forwards $ 48.0