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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fair value of financial assets and liabilities |  |
Total financial assets | $ 96,163 | $ 33,426
Total financial liabilities |  | 10,485
Money market funds |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 59,302 | 3,912
Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 25,698 | 26,088
United States government agency securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets |  | 3,426
Marketable equity securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 11,163 |
2010 Warrant Liability |  |
Fair value of financial assets and liabilities |  |
Total financial liabilities |  | 10,485
Level 1 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 70,465 | 3,912
Level 1 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 59,302 | 3,912
Level 1 | Marketable equity securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 11,163 |
Level 2 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 25,698 | 29,514
Level 2 | Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | $ 25,698 | 26,088
Level 2 | United States government agency securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets |  | 3,426
Level 3 |  |
Fair value of financial assets and liabilities |  |
Total financial liabilities |  | 10,485
Level 3 | 2010 Warrant Liability |  |
Fair value of financial assets and liabilities |  |
Total financial liabilities |  | $ 10,485

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