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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair value of financial assets and liabilities |  |
Total financial assets | $ 58,059 | $ 96,163
Money market funds |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 8,991 | 59,302
United States government agency securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 8,029 |
United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 8,029 |
Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 37,087 | 25,698
Marketable equity securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 3,952 | 11,163
Level 1 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 12,943 | 70,465
Level 1 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 8,991 | 59,302
Level 1 | Marketable equity securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 3,952 | 11,163
Level 2 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 45,116 | 25,698
Level 2 | United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 8,029 |
Level 2 | Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | $ 37,087 | $ 25,698

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