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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Fair value of financial assets and liabilities |  |  |  |  |
Total financial assets |  | $ 98,821 |  | $ 33,426 |
Total financial liabilities |  | 2,424 |  | 10,485 |
Money market funds |  |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |
Total financial assets |  | 42,169 | [1] | 3,912 | [2]
Corporate debt securities |  |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |
Total financial assets |  | 18,965 | [3] | 26,088 | [4]
United States government agency securities |  |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |
Total financial assets |  | 30,003 | [3] | 3,426 | [4]
Aduro equity securities |  |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |
Total financial assets | [5] | 7,684 |  |  |
2010 Warrant Liability |  |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |
Total financial liabilities |  | 2,424 | [6] | 10,485 | [7]
Level 1 |  |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |
Total financial assets |  | 49,853 |  | 3,912 |
Level 1 | Money market funds |  |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |
Total financial assets |  | 42,169 | [1] | 3,912 | [2]
Level 1 | Aduro equity securities |  |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |
Total financial assets | [5] | 7,684 |  |  |
Level 2 |  |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |
Total financial assets |  | 48,968 |  | 29,514 |
Level 2 | Corporate debt securities |  |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |
Total financial assets |  | 18,965 | [3] | 26,088 | [4]
Level 2 | United States government agency securities |  |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |
Total financial assets |  | 30,003 | [3] | 3,426 | [4]
Level 3 |  |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |
Total financial liabilities |  | 2,424 |  | 10,485 |
Level 3 | 2010 Warrant Liability |  |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |
Total financial liabilities |  | $ 2,424 | [6] | $ 10,485 | [7]
[1] | Included in cash and cash equivalents on the Company's unaudited condensed consolidated balance sheets.
[2] | Included in cash and cash equivalents on the Company's consolidated balance sheets.
[3] | Included in short-term investments on the Company's unaudited condensed consolidated balance sheets.
[4] | Included in short-term investments on the Company's consolidated balance sheets, except for approximately $1.0 million of corporate debt securities that are included in cash and cash equivalents on the Company's consolidated balance sheets.
[5] | Included in investment in marketable equity securities on the Company's unaudited condensed consolidated balance sheets.
[6] | Included in current liabilities on the Company's unaudited condensed consolidated balance sheets.
[7] | Included in current liabilities on the Company's consolidated balance sheets.

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