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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair value of financial assets and liabilities |  |
Total short-term investments | $ 61,629 | $ 59,267
Investment, Type [Extensible Enumeration] | Short-Term Investments [Member] | Short-Term Investments [Member]
Money market funds |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | $ 7,639 | $ 5,062
United States government agency securities |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 23,902 | $ 19,354
Investment, Type [Extensible Enumeration] |  | Short-Term Investments [Member]
Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | $ 27,129 | $ 31,760
Investment, Type [Extensible Enumeration] | Short-Term Investments [Member] | Short-Term Investments [Member]
Mortgage-backed securities |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | $ 2,959 | $ 3,091
Investment, Type [Extensible Enumeration] | Short-Term Investments [Member] | Short-Term Investments [Member]
Level 1 |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | $ 7,639 | $ 5,062
Investment, Type [Extensible Enumeration] | Short-Term Investments [Member] | Short-Term Investments [Member]
Level 1 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | $ 7,639 | $ 5,062
Level 2 |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | $ 53,990 | $ 54,205
Investment, Type [Extensible Enumeration] | Short-Term Investments [Member] | Short-Term Investments [Member]
Level 2 | United States government agency securities |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | $ 23,902 | $ 19,354
Investment, Type [Extensible Enumeration] | Short-Term Investments [Member] | Short-Term Investments [Member]
Level 2 | Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | $ 27,129 | $ 31,760
Investment, Type [Extensible Enumeration] | Short-Term Investments [Member] | Short-Term Investments [Member]
Level 2 | Mortgage-backed securities |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | $ 2,959 | $ 3,091
Investment, Type [Extensible Enumeration] | Short-Term Investments [Member] | Short-Term Investments [Member]

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