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Fair Value on Financial Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | $ 46,500 |  | $ 10,268 |
Total financial liabilities | 10,290 |  | 5,903 |
Money Market Funds |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 46,500 | [1] | 10,268 | [1]
Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | 10,290 |  | 5,903 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 46,500 |  | 10,268 |
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 | 46,500 | [1] | 10,268 | [1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | 0 |  | 0 |
Significant Other Observable Inputs (Level 2) |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 |  | 0 |
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) | Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial assets | 0 |  | 0 |
Total financial liabilities | 10,290 |  | 5,903 |
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) | Warrant Liability |  |  |  |
Fair value of financial assets and liabilities |  |  |  |
Total financial liabilities | $ 10,290 |  | $ 5,903 |
[1] | Included in cash and cash equivalents on the Company's condensed consolidated balance sheets.

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