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Warrants (Fair Value of Warrants is Estimated Using Black-Scholes Option Pricing Model) (Detail) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
March 2015 Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Strike price | $ 2.08 |
Expected term (years) | 4 years 5 months 19 days |
Volatility % | 74.99% |
Risk-free rate % | 1.25% |
September 2013 Warrant [Member] |  |
Class of Warrant or Right [Line Items] |  |
Strike price | $ 2.50 | $ 2.50
Expected term (years) | 2 years 11 months 19 days | 3 years 8 months 19 days
Volatility % | 76.85% | 75.60%
Risk-free rate % | 0.91% | 1.30%
December 2012 Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Strike price | $ 1.83 | $ 1.90
Expected term (years) | 2 years 2 months 23 days | 2 years 11 months 23 days
Volatility % | 75.45% | 76.85%
Risk-free rate % | 0.70% | 1.09%
April 2011 Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Strike price | $ 0.65 | $ 0.65
Expected term (years) | 1 year 6 months 22 days | 2 years 3 months 22 days
Volatility % | 69.48% | 78.24%
Risk-free rate % | 0.50% | 0.80%
March 2011 Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Strike price | $ 0.65 | $ 0.65
Expected term (years) | 5 months 5 days | 1 year 2 months 5 days
Volatility % | 72.42% | 77.38%
Risk-free rate % | 0.06% | 0.32%
March 2010 Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Strike price | $ 2.02 | $ 2.15
Expected term (years) | 5 months 27 days | 1 year 2 months 27 days
Volatility % | 68.33% | 77.12%
Risk-free rate % | 0.08% | 0.35%

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