Income taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Net loss	$ (40,664)	$ (60,896)
United States statutory income tax rate	21.00%	21.00%
Income tax benefit at United States statutory income tax rate	$ (8,540)	$ (12,788)
Change in valuation allowance	8,170	13,786
Warrant fair value adjustment	(1)	0
Adjustment of prior year income taxes	264	(1,067)
Nondeductible expenses	107	69
Income tax expense (benefit)	$ 0	$ 0
Tax Jurisdiction of Domicile [Extensible Enumeration]	UNITED STATES