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Cash and Investments in Marketable Securities - Cash and Investments in Marketable Securities, Including Cash Equivalents (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Estimated Fair Value at |  |
Cash and cash equivalents | $ 64,921 | $ 88,227
Short-term investments | 307,737 | 416,750
Total cash and investments in marketable securities | $ 372,658 | $ 504,977

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