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Stockholders' Equity (Details 2) - Employee Stock Option [Member] - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]      
Reserved but unissued shares under the Consultant Plan at January 1 643,817 565,765  
Granted - Options to Purchase Common Stock 409,200 141,880  
Exercised - Options to Purchase Common Stock (212,837) (39,140)  
Forfeited/Expired/Exchanged - Options to Purchase Common Stock (116,780) (24,688)  
Reserved but unissued shares under the Consultant Plan at December 31 723,400 643,817 565,765
Exercisable - Options to Purchase Common Stock 257,391 441,958  
Outstanding - Weighted Average Exercise Price $ 4.46 $ 3.19  
Granted - Weighted Average Exercise Price 5.39 9.68  
Exercised - Weighted Average Exercise Price 2.51 3.11  
Forfeited/Expired/Exchanged - Weighted Average Exercise Price 6.86 7.36  
Outstanding - Weighted Average Exercise Price 5.18 4.46 $ 3.19
Exercisable - Weighted Average Exercise Price $ 4.05 $ 3.50  
Outstanding - Weighted Average Remaining Contractual Life (in years) 8 years 1 month 6 days 5 years 8 months 1 day 8 years 2 months 16 days
Granted - Weighted Average Remaining Contractual Life (in years) 9 years 2 months 19 days 7 years 8 months 12 days  
Exercised - Weighted Average Remaining Contractual Life (in years) 0 years 0 years  
Forfeited/Expired/Exchanged - Weighted Average Remaining Contractual Life (in years) 0 years 0 years  
Exercisable - Weighted Average Remaining Contractual Life (in years) 6 years 1 month 13 days 4 years 5 months 19 days