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Stock-Based Compensation (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of stock-based compensation expense      
Stock compensation expense $ 1,075 $ 1,729 $ 2,656
Remaining unamortized expense of stock-based compensation 520    
Research and Development [Member]      
Summary of stock-based compensation expense      
Stock compensation expense 484 510 267
Sales and Marketing [Member]      
Summary of stock-based compensation expense      
Stock compensation expense 296 353 909
General and Administrative [Member]      
Summary of stock-based compensation expense      
Stock compensation expense $ 295 $ 866 $ 1,480