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Stock-Based Compensation, Option Pricing Assumptions (Details)
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield 0.00% 0.00%
Expected volatility   67.00%
Expected term 6 years 3 months 6 years 3 months
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected volatility 74.00%  
Risk-free interest rate 1.60% 2.00%
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected volatility 75.00%  
Risk-free interest rate 2.10% 2.30%