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Restructuring charges - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Restructuring Reserve [Roll Forward]
Restructuring charges			$ 4,044	$ 24,412	$ 738
First quarter 2024 restructuring
Restructuring Cost and Reserve [Line Items]
Expected percent of positions eliminated		4.00%
Severance Costs		$ 2,300
Restructuring Costs and Asset Impairment Charges		600
First quarter 2024 restructuring \| Cease of use impairment charge
Restructuring Cost and Reserve [Line Items]
Restructuring Costs and Asset Impairment Charges		3,300
Third quarter 2024 restructuring
Restructuring Cost and Reserve [Line Items]
Expected percent of positions eliminated	25.00%
Severance Costs	$ 12,700
Restructuring Reserve [Roll Forward]
Restructuring liability Start of Period			8,573
Cash paid			(4,254)
Non-cash settlements			(319)
Restructuring liability End of Period		8,573	4,000	8,573
Restructuring charges	18,700
Third quarter 2024 restructuring \| Employee Severance and Pay Related Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability Start of Period			2,535
Cash paid			(2,216)
Non-cash settlements			(319)
Restructuring liability End of Period		2,535	0	2,535
Third quarter 2024 restructuring \| Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Cash paid			(2,038)
Non-cash settlements			0
Third quarter 2024 restructuring \| Contract Termination
Restructuring Reserve [Roll Forward]
Restructuring liability Start of Period			6,038
Restructuring liability End of Period		$ 6,038	$ 4,000	$ 6,038
Restructuring charges	$ 6,000