Cash, Cash Equivalents, and Investments - Gross Unrealized Losses and Fair Values for Available-for-Sale Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale
Fair value, less than 12 months	$ 152,406	$ 68,557
Unrealized losses, less than 12 months	(2,594)	(1,561)
Fair value, 12 months or greater	229,640	233,304
Unrealized losses, 12 months or greater	(7,073)	(8,994)
Total fair value	382,046	301,861
Total unrealized Losses	(9,667)	(10,555)
Corporate bonds
Debt Securities, Available-for-sale
Fair value, less than 12 months	95,052	30,770
Unrealized losses, less than 12 months	(1,087)	(359)
Fair value, 12 months or greater	222,979	226,643
Unrealized losses, 12 months or greater	(6,896)	(8,807)
Total fair value	318,031	257,413
Total unrealized Losses	(7,983)	(9,166)
Treasury notes
Debt Securities, Available-for-sale
Fair value, less than 12 months	42,612	20,725
Unrealized losses, less than 12 months	(647)	(153)
Fair value, 12 months or greater	2,441	2,441
Unrealized losses, 12 months or greater	(60)	(60)
Total fair value	45,053	23,166
Total unrealized Losses	(707)	(213)
Asset-backed securities
Debt Securities, Available-for-sale
Fair value, less than 12 months	14,742	17,062
Unrealized losses, less than 12 months	(860)	(1,049)
Fair value, 12 months or greater	2,252	2,252
Unrealized losses, 12 months or greater	(48)	(47)
Total fair value	16,994	19,314
Total unrealized Losses	(908)	(1,096)
Sovereign bonds
Debt Securities, Available-for-sale
Fair value, less than 12 months	0	0
Unrealized losses, less than 12 months	0	0
Fair value, 12 months or greater	1,968	1,968
Unrealized losses, 12 months or greater	(69)	(80)
Total fair value	1,968	1,968
Total unrealized Losses	$ (69)	$ (80)