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Fair Value Measurements - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2014
Sep. 30, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Risk-free interest rate 0.13%  
Expected dividend yield 0.00%  
Expected price volatility 107.00%  
Expected term (in years) 9 months 18 days  
Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Liabilities measured at fair value   $ 0