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Marketable Securities - Summary of Marketable Securities by Security (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Marketable Securities [Line Items]
Amortized Cost	$ 797,692	$ 384,487
Gross Unrealized Gains	1,666	419
Gross Unrealized Losses	(293)	(388)
Fair Value	799,065	384,518
Commercial paper [Member]
Marketable Securities [Line Items]
Amortized Cost	191,922	67,098
Gross Unrealized Gains	33	26
Gross Unrealized Losses	(73)	(44)
Fair Value	191,882	67,080
Corporate bonds [Member]
Marketable Securities [Line Items]
Amortized Cost	408,501	193,876
Gross Unrealized Gains	1,490	328
Gross Unrealized Losses	(150)	(255)
Fair Value	409,841	193,949
Government and agency securities [Member]
Marketable Securities [Line Items]
Amortized Cost	120,338	89,044
Gross Unrealized Gains	141	58
Gross Unrealized Losses	(35)	(75)
Fair Value	120,444	89,027
US Treasury Securities [Member]
Marketable Securities [Line Items]
Amortized Cost	76,931	34,469
Gross Unrealized Gains	2	7
Gross Unrealized Losses	(35)	(14)
Fair Value	$ 76,898	$ 34,462

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