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Stock-Based Compensation (Details) - Stock Options [Member]
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Weighted average assumptions used to estimate fair value of options granted    
Expected volatility 162.90% 182.80%
Expected life of option 6 years 1 month 13 days 6 years 2 months 1 day
Risk free interest rate 1.48% 1.76%
Expected dividend yield 0.00% 0.00%