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Stock-Based Compensation (Details 1)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2013
Equity compensation plans, Valuation Assumptions    
Average risk-free interest rate 0.93% 2.07%
Expected dividend yield
Expected volatility 61.00% 65.60%
Expected term 5 years 6 months 6 years 6 months