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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Money market funds |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | $ 4,170 | $ 14,472
Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 65,787 | 81,041
United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 25,683 | 26,423
Corporate debt securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 32,954 | 36,795
Mortgage-backed securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 2,980 | 3,351
Level 1 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 4,170 | 14,472
Level 1 | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 4,170 | 14,472
Level 2 | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 61,617 | 66,569
Level 2 | United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 25,683 | 26,423
Level 2 | Corporate debt securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 32,954 | 36,795
Level 2 | Mortgage-backed securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | $ 2,980 | $ 3,351

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