Income taxes (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Canadian federal
NOL Carry Forwards	$ 220.0
Scientific research and experimental development expenditures available to reduce future taxable income	29.5
State and local
NOL Carry Forwards	216.0
Scientific research and experimental development expenditures available to reduce future taxable income	35.2
United States
NOL Carry Forwards	$ 67.0