Derivatives (Details 1) (USD $)
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1 Months Ended | 9 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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Sep. 30, 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 | $ 0.39 | $ 0.37 | $ 1.65 | [1] | $ 1.17 | [1] | $ 0.37 | ||||||||||
Risk free interest rate (2) | 0.94% | 1.24% | 0.33% | [2] | 1.35% | |||||||||||||
Warrant lives in years | 6 years | 7 years | 7 years | |||||||||||||||
Expected volatility (3) | 161.00% | 157.00% | 139.00% | [3] | 156.00% | |||||||||||||
Expected dividend yield (4) | [4] | [4] | ||||||||||||||||
Probability of stock offering in any period over 5 years (5) | 25.00% | 25.00% | 25.00% | 25.00% | [5] | 25.00% | ||||||||||||
Range of percentage of existing shares offered (6) | 35.00% | 35.00% | 35.00% | 35.00% | 35.00% | |||||||||||||
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 | $ 2.475 | $ 0.81 | $ 0.26 | ||||||||||||
Risk free interest rate (2) | 0.77% | 0.77% | [2] | |||||||||||||||
Warrant lives in years | 5 years | 4 years 2 months 19 days | 5 years | |||||||||||||||
Expected volatility (3) | 161.00% | 161.00% | [3] | |||||||||||||||
Probability of stock offering in any period over 5 years (5) | 40.00% | [5] | ||||||||||||||||
Offering price range (7) | $ 0.55 | $ 0.60 | $ 0.56 | $ 0.55 | $ 0.55 | |||||||||||||
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 | $ 1.50 | $ 0.48 | $ 0.24 | ||||||||||||
Risk free interest rate (2) | 0.10% | 0.10% | [2] | |||||||||||||||
Warrant lives in years | 4 months | 0 days | 4 months | |||||||||||||||
Expected volatility (3) | 125.00% | 125.00% | [3] | |||||||||||||||
Probability of stock offering in any period over 5 years (5) | 25.00% | [5] | ||||||||||||||||
Offering price range (7) | $ 0.01 | $ 0.12 | $ 0.13 | $ 0.01 | $ 0.18 | |||||||||||||
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