Marketable Securities - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Marketable Securities [Line Items]
Amortized Cost	$ 798,368	$ 326,907
Unrealized Gains	2,334	166
Unrealized Losses	(415)	(724)
Fair Value	800,287	326,349
US Treasury Securities
Marketable Securities [Line Items]
Amortized Cost	170,704	23,361
Unrealized Gains	484	5
Unrealized Losses	(24)	(113)
Fair Value	171,164	23,253
US Government Agencies
Marketable Securities [Line Items]
Amortized Cost	186,095	142,948
Unrealized Gains	212	48
Unrealized Losses	(344)	(305)
Fair Value	185,963	142,691
Commercial Paper
Marketable Securities [Line Items]
Amortized Cost	28,587
Unrealized Gains	17
Unrealized Losses	(1)
Fair Value	28,603
Corporate Securities
Marketable Securities [Line Items]
Amortized Cost	412,982	160,598
Unrealized Gains	1,621	113
Unrealized Losses	(46)	(306)
Fair Value	$ 414,557	$ 160,405