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Derivatives (Details 1) - Derivative [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
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%
[1] | The market value of common stock at the above measurement dates is based on the Company's closing price quoted on the NYSE American
[2] | The risk-free interest rate was determined by management using the Treasury Bill rate as of the respective measurement date.
[3] | The volatility was estimated using the historical volatilities of the Company's common stock traded in NYSE American.
[4] | Management does not expect to pay dividends for the foreseeable future.
[5] | Management determines the probability of future stock offering at each evaluation date.
[6] | Represents the estimated offering price in future offerings as determined by management.

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