Derivatives (Details 1) (USD $)
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9 Months Ended | 12 Months Ended | ||||||||||||||||
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Sep. 30, 2014
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Dec. 31, 2013
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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) | $ 6.70 | [1] | $ 5.89 | [1] | ||||||||||||||
Adjusted exercise price | $ 2.48 | $ 2.48 | ||||||||||||||||
Risk free interest rate (2) | 1.07% | [2] | 1.27% | [2] | ||||||||||||||
Warrant lives in years | 3 years 2 months 12 days | 6 months | ||||||||||||||||
Expected volatility (3) | 74.00% | [3] | 73.00% | [3] | ||||||||||||||
Expected dividend yield (4) | [4] | [4] | ||||||||||||||||
Probability of stock offering in any period over 5 years (5) | 25.00% | [5] | 25.00% | [5] | ||||||||||||||
Range of percentage of existing shares offered (6) | [6] | 35.00% | [6] | |||||||||||||||
Offering price range (7) | $ 7.50 | [7] | $ 9 | [7] | ||||||||||||||
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