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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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