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Fair Value on Financial Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | $ 33,911 |  | $ 36,841 |
Total financial liabilities | 11,356 |  | 20,390 |
Money market funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 9,648 | [1] | 8,650 | [1]
Corporate debt securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 20,251 | [2] | 23,173 | [2]
United States government agency securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 4,012 | [2] | 5,018 | [2]
Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | 11,356 | [3] | 20,390 | [3]
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 9,648 |  | 8,650 |
Total financial liabilities | 0 |  | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 9,648 | [1] | 8,650 | [1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 | [2] | 0 | [2]
Quoted Prices in Active Markets for Identical Assets (Level 1) | United States government agency securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 | [2] | 0 | [2]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | 0 | [3] | 0 | [3]
Significant Other Observable Inputs (Level 2) |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 24,263 |  | 28,191 |
Total financial liabilities | 0 |  | 0 |
Significant Other Observable Inputs (Level 2) | Money market funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 | [1] | 0 | [1]
Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 20,251 | [2] | 23,173 | [2]
Significant Other Observable Inputs (Level 2) | United States government agency securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 4,012 | [2] | 5,018 | [2]
Significant Other Observable Inputs (Level 2) | Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | 0 | [3] | 0 | [3]
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 |  | 0 |
Total financial liabilities | 11,356 |  | 20,390 |
Significant Unobservable Inputs (Level 3) | Money market funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 | [1] | 0 | [1]
Significant Unobservable Inputs (Level 3) | Corporate debt securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 | [2] | 0 | [2]
Significant Unobservable Inputs (Level 3) | United States government agency securities |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 | [2] | 0 | [2]
Significant Unobservable Inputs (Level 3) | Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | $ 11,356 | [3] | $ 20,390 | [3]
[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.
[3] | Included in current liabilities on the Company's condensed consolidated balance sheets.

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