Derivatives (Details 1) - $ / shares  | 
9 Months Ended | 12 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2016  | 
Dec. 31, 2015  | 
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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] | $ 1.35 | $ 3.23 | ||||||||||||
| Adjusted exercise price | $ 2.34 | $ 2.48 | |||||||||||||
| Risk free interest rate | [2] | 0.59% | 1.06% | ||||||||||||
| Warrant lives in years | 1 year 3 months | 2 years | |||||||||||||
| Expected volatility | [3] | 75.00% | 87.00% | ||||||||||||
| Expected dividend yield | [4] | ||||||||||||||
| Probability of stock offering in any period over 5 years | [5] | 100.00% | 100.00% | ||||||||||||
| Offering price | [6] | $ 1.25 | $ 2.60 | ||||||||||||
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