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Stock-Based Compensation (Details) - Stock Options [Member]
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Weighted average assumptions used to estimate fair value of options granted    
Expected volatility 167.70% 179.50%
Expected life of option 6 years 1 month 24 days 6 years 11 days
Risk free interest rate 1.50% 1.72%
Expected dividend yield 0.00% 0.00%