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Warrants (Fair Value of Warrants is Estimated Using Black-Scholes Option Pricing Model) (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
September 2013 Warrant [Member] |  |
Class of Warrant or Right [Line Items] |  |
Strike price | $ 2.50 | $ 0
Expected term (years) | 4 years 8 months 19 days | 0 years
Volatility % | 71.97% | 0.00%
Risk-free rate % | 1.61% | 0.00%
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 | 4 years 11 months 23 days
Volatility % | 71.38% | 80.93%
Risk-free rate % | 1.25% | 0.72%
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 | 4 years 3 months 18 days
Volatility % | 71.71% | 82.48%
Risk-free rate % | 0.93% | 0.59%
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 | 3 years 2 months 5 days
Volatility % | 73.45% | 69.90%
Risk-free rate % | 0.45% | 0.39%
March 2010 Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Strike price | $ 2.15 | $ 2.18
Expected term (years) | 2 years 2 months 27 days | 3 years 2 months 27 days
Volatility % | 73.36% | 69.79%
Risk-free rate % | 0.47% | 0.40%
August 2009 Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Strike price | $ 4.50 | $ 4.50
Expected term (years) | 7 months 2 days | 1 year 7 months 2 days
Volatility % | 66.85% | 74.13%
Risk-free rate % | 0.11% | 0.21%

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- Definition Warrants Fair Value Assumptions Expected Volatility + References No definition available. + Details
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- Details
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