Derivatives (Details 1) (USD $)
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12 Months Ended | |||||||||||||||
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Dec. 31, 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) | $ 5.89 | [1] | $ 5.89 | [1] | ||||||||||||
Adjusted exercise price | $ 2.48 | $ 2.48 | ||||||||||||||
Risk free interest rate (2) | 1.10% | [2] | 1.27% | [2] | ||||||||||||
Warrant lives in years | 3 years | 6 months | ||||||||||||||
Expected volatility (3) | 71.00% | [3] | 73.00% | [3] | ||||||||||||
Expected dividend yield (4) | [4] | [4] | ||||||||||||||
Probability of stock offering in any period over 5 years (5) | 100.00% | [5] | 25.00% | [5] | ||||||||||||
Offering price (6) | $ 4.50 | [6] | $ 9 | [6] | ||||||||||||
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