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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair value of financial assets and liabilities |  |
Total financial assets | $ 75,446 | $ 96,163
Money market funds |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 2,122 | 59,302
Level 1 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 7,052 | 70,465
Level 1 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 2,122 | 59,302
Level 2 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 68,394 | 25,698
United States government agency securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 25,194 |
United States government agency securities | United States government agency securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 4,998 |
United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 20,196 |
United States government agency securities | Level 2 | United States government agency securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 4,998 |
United States government agency securities | Level 2 | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 20,196 |
Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 43,200 | 25,698
Corporate debt securities | Level 2 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 43,200 | 25,698
Marketable equity securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 4,930 | 11,163
Marketable equity securities | Level 1 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | $ 4,930 | $ 11,163

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