Derivatives (Details 1) - Derivative [Member] - $ / shares |
12 Months Ended | ||||||||||||||
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Dec. 31, 2017 |
Dec. 31, 2016 |
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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] | $ 0.66 | $ 0.88 | ||||||||||||
Adjusted exercise price | $ 1.67 | $ 2.34 | |||||||||||||
Risk free interest rate | [2] | 2.09% | 0.85% | ||||||||||||
Warrant lives in years | 4 years 1 month 6 days | 2 years | |||||||||||||
Expected volatility | [3] | 80.00% | |||||||||||||
Expected dividend yield | [4] | 0.00% | 0.00% | ||||||||||||
Probability of stock offering in any period over 5 years | [5] | 100.00% | 100.00% | ||||||||||||
Offering price | [6] | $ 0.50 | $ 1.25 | ||||||||||||
Minimum [Member] | |||||||||||||||
Summary of fair values of derivative warrants on basis of valuation model | |||||||||||||||
Expected volatility | [3] | 61.00% | |||||||||||||
Maximum [Member] | |||||||||||||||
Summary of fair values of derivative warrants on basis of valuation model | |||||||||||||||
Expected volatility | [3] | 69.00% | |||||||||||||
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