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 |