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Fair Value Measurements and Financial Instruments - Cash Equivalents (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 3,904 | $ 5,860
Estimated Fair Value | 3,904 | 5,860
Money Market Funds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 3,904 | 5,860
Estimated Fair Value | 3,904 | 5,860
Cash and Cash Equivalents |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated Fair Value | $ 3,904 | $ 5,860

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