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Derivatives (Details 1) - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Summary of fair values of derivative warrants on basis of valuation model |  |  |
Expected dividend yield |  | 0.00% |
Minimum [Member] |  |  |
Summary of fair values of derivative warrants on basis of valuation model |  |  |
Warrant lives in years |  | 3 months |
Expected volatility |  | 45.72% |
Maximum [Member] |  |  |
Summary of fair values of derivative warrants on basis of valuation model |  |  |
Warrant lives in years |  | 8 years 10 months 25 days |
Expected volatility |  | 79.81% |
Derivative warrants [Member] |  |  |
Summary of fair values of derivative warrants on basis of valuation model |  |  |
Market value of common stock on measurement date | [1] | $ 1.22 | $ 0.88
Adjusted exercise price |  | $ 2.34 | $ 2.34
Risk free interest rate | [2] |  | 0.85%
Warrant lives in years |  |  | 2 years
Expected dividend yield | [3] |  |
Probability of stock offering in any period over 5 years | [4] | 100.00% | 100.00%
Offering price | [5] | $ 0.75 | $ 1.25
Derivative warrants [Member] | Minimum [Member] |  |  |
Summary of fair values of derivative warrants on basis of valuation model |  |  |
Risk free interest rate | [2] | 1.14% |
Warrant lives in years |  | 2 years |
Expected volatility | [6] | 73.00% | 61.00%
Derivative warrants [Member] | Maximum [Member] |  |  |
Summary of fair values of derivative warrants on basis of valuation model |  |  |
Risk free interest rate | [2] | 1.81% |
Warrant lives in years |  | 4 years 7 months 6 days |
Expected volatility | [6] | 82.00% | 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 MKT.
[2] | The risk-free interest rate was determined by management using the Treasury Bill rate as of the respective measurement date.
[3] | Management determined the dividend yield to be 0% based upon its expectation that it will not pay dividends for the foreseeable future.
[4] | Management determines the probability of future stock offering at each evaluation date.
[5] | Represents the estimated offering price in future offerings as determined by management.
[6] | The volatility was estimated using the historical volatilities of the Company's common stock traded in NYSE MKT market.

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- Definition Agreed upon price for the exchange of the underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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