Income taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income (loss) from continuing operations before income taxes, foreign	$ (127,000)	$ 0	$ 0
Stock-based compensation, tax benefits		$ 400,000	$ 0
Operating loss carryforwards	168,400,000
Deferred tax assets, operating loss carryforwards	38,600,000
Deferred tax assets, operating loss carryforwards, not subject to expiration	$ 129,800,000