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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.