Investments - Continuous Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses	$ (6,005)	$ (922)
Fair Value	501,927	372,482
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses	(3,556)	(474)
Fair Value	237,757	146,454
U.S. agency and government sponsored securities
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses	(116)	(25)
Fair Value	4,881	4,970
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses	(156)	(4)
Fair Value	82,012	30,285
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses	(1,838)	(345)
Fair Value	145,882	145,522
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses	(339)	(74)
Fair Value	$ 31,395	$ 45,251