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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