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Warrants (Fair Value of Warrants is Estimated Using Black-Scholes Option Pricing Model) (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2014 | Dec. 31, 2013
December 2012 Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Strike price |  | $ 1.90 | $ 1.90
Expected term (years) | 3 years 11 months 23 days | 3 years 2 months 23 days |
Volatility % |  | 76.97% | 71.38%
Risk-free rate % |  | 1.15% | 1.25%
April 2011 Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Strike price |  | $ 0.65 | $ 0.65
Expected term (years) | 3 years 3 months 22 days | 2 years 6 months 22 days |
Volatility % |  | 78.24% | 71.71%
Risk-free rate % |  | 0.85% | 0.93%
March 2011 Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Strike price |  | $ 0.65 | $ 0.65
Expected term (years) | 2 years 2 months 5 days | 1 year 5 months 5 days |
Volatility % |  | 79.41% | 73.45%
Risk-free rate % |  | 0.32% | 0.45%
March 2010 Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Strike price |  | $ 2.15 | $ 2.15
Expected term (years) | 2 years 2 months 27 days | 1 year 5 months 27 days |
Volatility % |  | 79.03% | 73.36%
Risk-free rate % |  | 0.35% | 0.47%
August 2009 Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Strike price |  |  | $ 4.50
Expected term (years) | 7 months 2 days |  |
Volatility % |  |  | 66.85%
Risk-free rate % |  |  | 0.11%
September 2013 Warrant [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Strike price |  | $ 2.50 | $ 2.50
Expected term (years) | 4 years 8 months 19 days | 3 years 11 months 19 days |
Volatility % |  | 74.39% | 71.97%
Risk-free rate % |  | 1.41% | 1.61%

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- Definition Warrants Fair Value Assumptions Expected Volatility + References No definition available. + Details
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- Definition Warrants Fair Value Assumptions Risk Free Interest Rate + References No definition available. + Details
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- Definition Warrant Strike Price + References No definition available. + Details
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- Details
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