Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Accruals and reserves	$ 3,852	$ 4,409
Deferred revenue	64,179	62,000
Net operating loss	21,983	36,508
Research and development tax credits	34,772	28,645
Stock-based compensation expense	4,005	6,242
Indirect tax reserves	377	240
Property and equipment, net	2,088	2,000
Capitalized research and development costs	48,726	35,505
Operating lease liabilities	2,152	1,460
Other deferred tax assets	3,052	564
Gross deferred tax assets	185,186	177,573
Valuation allowance	(165,488)	(150,915)
Total deferred tax assets	19,698	26,658
Deferred tax liabilities:
Deferred contract costs	(9,329)	(16,791)
Operating lease right-of-use-assets	(2,064)	(1,129)
Other deferred tax liabilities	(8,067)	(8,573)
Total deferred tax liabilities	(19,460)	(26,493)
Net deferred tax assets	$ 238	$ 165