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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Fair value of financial assets and liabilities |  |
Total financial assets | $ 82,243 | $ 96,163
Money market funds |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 6,648 | 59,302
Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 60,516 | 25,698
Marketable equity securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 5,082 | 11,163
United States government agency securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 9,997 |
Level 1 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 11,730 | 70,465
Level 1 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 6,648 | 59,302
Level 1 | Marketable equity securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 5,082 | 11,163
Level 2 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 70,513 | 25,698
Level 2 | Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 60,516 | $ 25,698
Level 2 | United States government agency securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | $ 9,997 |

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