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Stockholders' Equity (Details 1) - Employee Stock Option [Member] - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options outstanding 1,722,552 1,528,737
Options outstanding, Weighted average remaining contractual life (Years) 6 years 4 months 17 days  
Options outstanding, Weighted average exercise price (in dollars per share) $ 5.21 $ 4.20
Options outstanding, Aggregate intrinsic value $ 13,363,290  
Number of options exerciseable 1,238,423  
Options exercisable, Weighted average remaining contractual life (Years) 5 years 3 months 22 days  
Options exercisable, Weighted average exercise price (in dollars per share) $ 3.72  
Options exercisable, Aggregate intrinsic value $ 11,402,022