Investments - Continuous Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses	$ (5,989)	$ (922)
Fair Value	480,393	372,482
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses	(3,684)	(474)
Fair Value	207,102	146,454
U.S. agency and government sponsored securities
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses	(117)	(25)
Fair Value	4,881	4,970
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses	(306)	(4)
Fair Value	123,678	30,285
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses	(1,676)	(345)
Fair Value	123,845	145,522
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses	(206)	(74)
Fair Value	$ 20,887	$ 45,251