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Fair Value of Warrants Using Valuation Model (Detail) - 2010 Warrant Liability
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Expected term (in years) 1 month 10 days 10 months 10 days
Estimated volatility 61.00% 55.00%
Risk-free interest rate 0.02% 0.25%
Expected dividend yield 0.00% 0.00%