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Fair Value on Financial Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | $ 36,833 |  | $ 10,268 |
Total financial liabilities | 22,706 |  | 5,903 |
Money market funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 7,862 | [1] | 10,268 | [1]
Corporate debt securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 24,948 | [2] |  |
United States government agency securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 4,023 | [2] |  |
Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | 22,706 |  | 5,903 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 7,862 |  | 10,268 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 7,862 | [1] | 10,268 | [1]
Significant Other Observable Inputs (Level 2) |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 28,971 |  |  |
Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 24,948 | [2] |  |
Significant Other Observable Inputs (Level 2) | United States government agency securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 4,023 | [2] |  |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | 22,706 |  | 5,903 |
Significant Unobservable Inputs (Level 3) | Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | $ 22,706 |  | $ 5,903 |
[1] | Included in cash and cash equivalents on the Company's condensed consolidated balance sheets.
[2] | Included in short-term investments on the Company's condensed consolidated balance sheets.

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