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Stock-Based Compensation (Details 4) - Stock Warrants [Member] - $ / shares |  | 12 Months Ended
--- | --- | ---
Oct. 10, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Closing stock price | $ 1.75 | $ 2.29 | $ 1.46
Expected dividends | 0.00% | 0.00% | 0.00%
Expected volatility | 95.00% | 85.00% | 90.00%
Risk free interest rate | 1.39% | 1.49% | 1.59%
Expected life of warrant | 5 years | 3 years 9 months 14 days | 4 years 8 months 12 days

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