Fair value measurements - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair value
Less than 12 months	$ 74,801	$ 153,737
12 months or greater	14,351	6,392
Total	89,152	160,129
Unrealized losses
Less than 12 months	(1,893)	(561)
12 months or greater	(192)	(6)
Total	(2,085)	(567)
U.S. government agency securities and treasuries
Fair value
Less than 12 months	68,129	108,695
12 months or greater	7,834	2,496
Total	75,963	111,191
Unrealized losses
Less than 12 months	(1,814)	(505)
12 months or greater	(166)	(4)
Total	(1,980)	(509)
Corporate bonds
Fair value
Less than 12 months	6,672	45,042
12 months or greater	6,517	3,896
Total	13,189	48,938
Unrealized losses
Less than 12 months	(79)	(56)
12 months or greater	(26)	(2)
Total	$ (105)	$ (58)