Income taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 0	$ 0
Effective income tax rate	0.00%	0.00%
Valuation allowance	$ 8,200	$ 13,800
Deferred tax assets valuation allowance	174,855	166,685
Net operating loss carryovers	$ 385,100	$ 352,600