Income taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Loss Carryforwards [Line Items]
Effective income tax rate, percent	54.34%	(5.37%)	(3.52%)
Valuation allowance	$ 160,923	$ 165,488
Valuation allowance increase	(4,600)
Research and development tax credits	37,378	34,772
Unrecognized tax benefits	9,975	$ 9,032	$ 7,232	$ 5,310
Domestic Tax Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	170,400
Research and development tax credits	30,600
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	58,000
Research and development tax credits	$ 20,200