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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation Expense

Stock-based compensation expense for the three months ended March 31 was as follows (in thousands):

 

     Three Months Ended
March 31,
 
     2015      2014  

Cost of revenues

   $ 61      $ 36  

Selling, general and administrative

     408        191  

Research and development

     94        7  
  

 

 

    

 

 

 

Total stock-based compensation

$ 563   $ 234