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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair value of financial assets and liabilities |  |
Fair Value | $ 72,659 | $ 94,885
Total financial assets | 72,659 | 94,885
Money market funds |  |
Fair value of financial assets and liabilities |  |
Fair Value |  | 6,167
Total financial assets |  | 6,167
United States government agency securities |  |
Fair value of financial assets and liabilities |  |
Fair Value | 11,030 | 15,948
Total financial assets | 11,030 | 15,948
United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Fair Value | 11,030 | 15,948
Total financial assets | 11,030 | 15,948
Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Fair Value | 61,629 | 72,770
Total financial assets | 61,629 | 72,770
Level 1 |  |
Fair value of financial assets and liabilities |  |
Fair Value |  | 6,167
Total financial assets |  | 6,167
Level 1 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Fair Value |  | 6,167
Total financial assets |  | 6,167
Level 2 |  |
Fair value of financial assets and liabilities |  |
Fair Value | 72,659 | 88,718
Total financial assets | 72,659 | 88,718
Level 2 | United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Fair Value | 11,030 | 15,948
Total financial assets | 11,030 | 15,948
Level 2 | Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Fair Value | 61,629 | 72,770
Total financial assets | $ 61,629 | $ 72,770

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