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Fair Value of Financial Instruments - Summary of Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Financial assets carried at fair value: |  |
Cash equivalents, fair value disclosure | $ 35,841 | $ 40,479
Short-term investments, available for sale | 880,093 | 306,563
Total financial assets | 915,934 | 347,042
Level 1 [Member] |  |
Financial assets carried at fair value: |  |
Cash equivalents, fair value disclosure | 35,841 | 16,411
Total financial assets | 35,841 | 16,411
Level 2 [Member] |  |
Financial assets carried at fair value: |  |
Cash equivalents, fair value disclosure |  | 24,068
Total financial assets | 880,093 | 330,631
Commercial paper, available-for-sale [Member] |  |
Financial assets carried at fair value: |  |
Short-term investments, available for sale | 14,550 | 24,226
Commercial paper, available-for-sale [Member] | Level 2 [Member] |  |
Financial assets carried at fair value: |  |
Short-term investments, available for sale | 14,550 | 24,226
Corporate debt securities, available-for-sale [Member] |  |
Financial assets carried at fair value: |  |
Short-term investments, available for sale | 692,572 | 168,584
Corporate debt securities, available-for-sale [Member] | Level 2 [Member] |  |
Financial assets carried at fair value: |  |
Short-term investments, available for sale | 692,572 | 168,584
Government debt securities [Member] |  |
Financial assets carried at fair value: |  |
Short-term investments, available for sale | 172,971 | 113,753
Government debt securities [Member] | Level 2 [Member] |  |
Financial assets carried at fair value: |  |
Short-term investments, available for sale | $ 172,971 | $ 113,753

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