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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair value of financial assets and liabilities |  |
Total financial assets | $ 117,358 | $ 59,592
Money market funds |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 15,788 | 8,860
United States government agency securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 18,746 | 15,561
United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 18,746 | 15,561
Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 82,824 | 35,171
Level 1 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 15,788 | 8,860
Level 1 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 15,788 | 8,860
Level 2 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 101,570 | 50,732
Level 2 | United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 18,746 | 15,561
Level 2 | Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | $ 82,824 | $ 35,171

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