Cash Equivalents and Investments - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	$ 1,517,238	$ 917,186
Less than 12 Months, Unrealized Losses	(2,606)	(4,006)
12 Months or Greater, Fair Value	478,319	0
12 Months or Greater, Unrealized Losses	(5,262)	0
Total, Fair Value	1,995,557	917,186
Total, Unrealized Losses	(7,868)	(4,006)
U.S. Treasury securities
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	1,046,150	486,424
Less than 12 Months, Unrealized Losses	(1,445)	(2,547)
12 Months or Greater, Fair Value	350,312	0
12 Months or Greater, Unrealized Losses	(4,415)	0
Total, Fair Value	1,396,462	486,424
Total, Unrealized Losses	(5,860)	(2,547)
U.S. agency securities
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	276,175	182,475
Less than 12 Months, Unrealized Losses	(258)	(197)
12 Months or Greater, Fair Value	32,458	0
12 Months or Greater, Unrealized Losses	(41)	0
Total, Fair Value	308,633	182,475
Total, Unrealized Losses	(299)	(197)
Corporate debt securities
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	194,913	248,287
Less than 12 Months, Unrealized Losses	(903)	(1,262)
12 Months or Greater, Fair Value	95,549	0
12 Months or Greater, Unrealized Losses	(806)	0
Total, Fair Value	290,462	248,287
Total, Unrealized Losses	$ (1,709)	$ (1,262)