Income taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Stock-based compensation, tax benefits	$ 300,000	$ 0	$ 0
Operating loss carryforwards	165,200,000
Deferred tax assets, operating loss carryforwards	38,700,000
Deferred tax assets, operating loss carryforwards, not subject to expiration	$ 126,500,000