Income taxes - Schedule of Loss from Continuing Operations Before Income Tax Expense (Benefit) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Domestic	$ (11,954,000)	$ (8,823,000)	$ (12,221,000)
Foreign	(127,000)	0	0
Loss from continuing operations before income tax expense (benefit)	$ (12,081,000)	$ (8,823,000)	$ (12,221,000)

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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