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Stockholders' Equity (Deficit) - Outstanding Warrants Valuation Assumption (Detail) - $ / shares
9 Months Ended 12 Months Ended
Feb. 18, 2015
Sep. 30, 2015
Dec. 31, 2014
March 2011 Warrants      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Risk-free interest rate   0.08% 0.67%
Expected life (in years)   5 months 16 days 1 year 2 months 16 days
Dividend yield   0.00% 0.00%
Volatility   53.00% 49.00%
Stock price   $ 4.07 $ 3.18
February 2015 Warrants      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Risk-free interest rate 1.52% 1.23%  
Expected life (in years) 5 years 4 years 4 months 17 days  
Dividend yield 0.00% 0.00%  
Volatility 50.00% 50.00%  
Stock price $ 4.26 $ 4.07