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Fair Value on Financial Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair value of financial assets and liabilities    
Total financial assets $ 36,841 $ 10,268
Total financial liabilities 20,390 5,903
Money market funds
    
Fair value of financial assets and liabilities    
Total financial assets 8,650 [1] 10,268 [2]
Corporate debt securities
    
Fair value of financial assets and liabilities    
Total financial assets 23,173 [3]  
United States government agency securities
    
Fair value of financial assets and liabilities    
Total financial assets 5,018 [3]  
Warrant Liability
    
Fair value of financial assets and liabilities    
Total financial liabilities 20,390 [4] 5,903 [4]
Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Fair value of financial assets and liabilities    
Total financial assets 8,650 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 8,650 [1] 10,268 [2]
Significant Other Observable Inputs (Level 2)
    
Fair value of financial assets and liabilities    
Total financial assets 28,191  
Significant Other Observable Inputs (Level 2) | Corporate debt securities
    
Fair value of financial assets and liabilities    
Total financial assets 23,173 [3]  
Significant Other Observable Inputs (Level 2) | United States government agency securities
    
Fair value of financial assets and liabilities    
Total financial assets 5,018 [3]  
Significant Unobservable Inputs (Level 3)
    
Fair value of financial assets and liabilities    
Total financial liabilities 20,390 5,903
Significant Unobservable Inputs (Level 3) | Warrant Liability
    
Fair value of financial assets and liabilities    
Total financial liabilities $ 20,390 [4] $ 5,903 [4]
[1] Included in cash and cash equivalents on the Company's consolidated balances sheets.
[2] Included in cash and cash equivalents on the Company's consolidated balance sheets.
[3] Included in short-term investments on the Company's consolidated balance sheets.
[4] Included in current liabilities on the Company's consolidated balance sheets.