Cash Equivalents and Investments - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	$ 1,915,291	$ 917,186
Less than 12 Months, Unrealized Losses	(7,367)	(4,006)
12 Months or Greater, Fair Value	58,125	0
12 Months or Greater, Unrealized Losses	(358)	0
Total, Fair Value	1,973,416	917,186
Total, Unrealized Losses	(7,725)	(4,006)
U.S. Treasury securities
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	1,459,154	486,424
Less than 12 Months, Unrealized Losses	(5,848)	(2,547)
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Unrealized Losses	0	0
Total, Fair Value	1,459,154	486,424
Total, Unrealized Losses	(5,848)	(2,547)
U.S. agency securities
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	223,619	182,475
Less than 12 Months, Unrealized Losses	(241)	(197)
12 Months or Greater, Fair Value	22,463	0
12 Months or Greater, Unrealized Losses	(37)	0
Total, Fair Value	246,082	182,475
Total, Unrealized Losses	(278)	(197)
Corporate debt securities
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	232,518	248,287
Less than 12 Months, Unrealized Losses	(1,278)	(1,262)
12 Months or Greater, Fair Value	35,662	0
12 Months or Greater, Unrealized Losses	(321)	0
Total, Fair Value	268,180	248,287
Total, Unrealized Losses	$ (1,599)	$ (1,262)