Derivatives (Details 1) (USD $)
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1 Months Ended | 12 Months Ended | ||||||||||||||||||||||||
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Dec. 19, 2012
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Dec. 27, 2012
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Jan. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Summary of fair values of derivative warrants on basis of valuation model | ||||||||||||||||||||||||||
Market value of common stock on measurement date (1) | $ 0.39 | [1] | $ 0.39 | [1] | $ 0.37 | [1] | $ 5.89 | [1] | $ 0.39 | [1] | $ 0.37 | [1] | ||||||||||||||
Adjusted exercise price | $ 2.48 | |||||||||||||||||||||||||
Risk free interest rate (2) | 0.94% | 1.24% | [2] | 1.27% | 1.35% | [2] | ||||||||||||||||||||
Warrant lives in years | 6 years | 7 years | 6 months | 7 years | ||||||||||||||||||||||
Expected volatility (3) | 161.00% | [3] | 157.00% | 73.00% | [3] | 156.00% | [3] | |||||||||||||||||||
Expected dividend yield (4) | [4] | [4] | [4] | [4] | ||||||||||||||||||||||
Probability of stock offering in any period over 5 years (5) | 25.00% | [5] | 25.00% | [5] | 25.00% | [5] | 25.00% | 25.00% | [5] | 25.00% | [5] | |||||||||||||||
Range of percentage of existing shares offered (6) | 35.00% | [6] | 35.00% | [6] | 35.00% | [6] | 35.00% | [6] | 35.00% | [6] | 35.00% | [6] | ||||||||||||||
Offering price range (7) | $ 9 | [7] | ||||||||||||||||||||||||
Maximum [Member]
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Summary of fair values of derivative warrants on basis of valuation model | ||||||||||||||||||||||||||
Adjusted exercise price | $ 0.83 | $ 0.26 | $ 0.26 | $ 0.83 | $ 0.26 | |||||||||||||||||||||
Risk free interest rate (2) | 0.77% | [2] | 0.77% | [2] | ||||||||||||||||||||||
Warrant lives in years | 5 years | 5 years | ||||||||||||||||||||||||
Expected volatility (3) | 161.00% | [3] | 161.00% | [3] | ||||||||||||||||||||||
Offering price range (7) | $ 0.55 | [7] | $ 0.60 | [7] | $ 0.56 | [7] | $ 0.55 | [7] | $ 0.55 | [7] | ||||||||||||||||
Minimum [Member]
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Summary of fair values of derivative warrants on basis of valuation model | ||||||||||||||||||||||||||
Adjusted exercise price | $ 0.41 | $ 0.22 | $ 0.23 | $ 0.41 | $ 0.24 | |||||||||||||||||||||
Risk free interest rate (2) | 0.10% | [2] | 0.10% | [2] | ||||||||||||||||||||||
Warrant lives in years | 4 months | 4 months | ||||||||||||||||||||||||
Expected volatility (3) | 125.00% | [3] | 125.00% | [3] | ||||||||||||||||||||||
Offering price range (7) | $ 0.01 | [7] | $ 0.12 | [7] | $ 0.13 | [7] | $ 0.01 | [7] | $ 0.18 | [7] | ||||||||||||||||
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