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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Summary of stock-based compensation expense    
Total stock based compensation expense $ 114 $ 598
Remaining unrecognized expense of stock-based compensation 385  
Product Research and Development [Member]    
Summary of stock-based compensation expense    
Total stock based compensation expense 43 223
Sales and Marketing [Member]    
Summary of stock-based compensation expense    
Total stock based compensation expense 62 106
General and Administrative [Member]    
Summary of stock-based compensation expense    
Total stock based compensation expense $ 9 $ 269