Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Deficit) - Financial Liabilities Subject to Fair Value Measurements (Detail)

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Stockholders' Equity (Deficit) - Financial Liabilities Subject to Fair Value Measurements (Detail) (Warrants, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
October 2009 Warrants
    
Class Of Warrant Or Right [Line Items]    
Financial liabilities subject to fair value measurements $ 1,013 $ 11,320
October 2009 Warrants | Basis of Fair Value Measurements, Level 3
    
Class Of Warrant Or Right [Line Items]    
Financial liabilities subject to fair value measurements 1,013 11,320
March 2011 Warrants
    
Class Of Warrant Or Right [Line Items]    
Financial liabilities subject to fair value measurements 5,551 12,101
March 2011 Warrants | Basis of Fair Value Measurements, Level 3
    
Class Of Warrant Or Right [Line Items]    
Financial liabilities subject to fair value measurements 5,551 12,101
Total Common Stock Warrants
    
Class Of Warrant Or Right [Line Items]    
Financial liabilities subject to fair value measurements 6,564 23,421
Total Common Stock Warrants | Basis of Fair Value Measurements, Level 3
    
Class Of Warrant Or Right [Line Items]    
Financial liabilities subject to fair value measurements $ 6,564 $ 23,421