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Fair Value on Financial Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | $ 31,416 |  | $ 36,841 |
Total financial liabilities | 3,931 |  | 20,390 |
Money market funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 6,185 | [1] | 8,650 | [1]
Corporate debt securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 21,802 | [2] | 23,173 | [2]
United States government agency securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 3,429 | [2] | 5,018 | [2]
Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | 3,931 | [3] | 20,390 | [3]
Level 1 |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 6,185 |  | 8,650 |
Total financial liabilities | 0 |  | 0 |
Level 1 | Money market funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 6,185 | [1] | 8,650 | [1]
Level 1 | Corporate debt securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 | [2] | 0 | [2]
Level 1 | United States government agency securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 | [2] | 0 | [2]
Level 1 | Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | 0 | [3] | 0 | [3]
Level 2 |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 25,231 |  | 28,191 |
Total financial liabilities | 0 |  | 0 |
Level 2 | Money market funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 | [1] | 0 | [1]
Level 2 | Corporate debt securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 21,802 | [2] | 23,173 | [2]
Level 2 | United States government agency securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 3,429 | [2] | 5,018 | [2]
Level 2 | Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | 0 | [3] | 0 | [3]
Level 3 |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 |  | 0 |
Total financial liabilities | 3,931 |  | 20,390 |
Level 3 | Money market funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 | [1] | 0 | [1]
Level 3 | Corporate debt securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 | [2] | 0 | [2]
Level 3 | United States government agency securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 | [2] | 0 | [2]
Level 3 | Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | $ 3,931 | [3] | $ 20,390 | [3]
[1] | Included in cash and cash equivalents on the Company's accompanying unaudited condensed consolidated balance sheets.
[2] | Included in short-term investments on the Company's accompanying unaudited condensed consolidated balance sheets.
[3] | Included in current liabilities on the Company's accompanying unaudited condensed consolidated balance sheets.

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