Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Accruals and reserves	$ 5,107	$ 4,795
Deferred revenue	61,285	45,268
Net operating loss	30,047	42,008
Research and development tax credits	20,412	13,301
Stock-based compensation expense	7,995	2,952
Indirect tax reserves	1,496	4,107
Property and equipment, net	2,031	1,799
Capitalized research and development costs	23,475	0
Operating lease liabilities	2,767	0
Other	491	351
Gross deferred tax assets	155,106	114,581
Valuation allowance	(129,453)	(97,010)
Total deferred tax assets	25,653	17,571
Deferred tax liabilities:
Deferred contract costs	(14,814)	(10,009)
Operating lease right-of-use assets	(2,245)	0
Other deferred tax liabilities	(8,594)	(7,562)
Total deferred tax liabilities	(25,653)	(17,571)
Net deferred tax liabilities	$ 0	$ 0