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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2016
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,  
     2016      2015  

Cost of revenues

   $ 52      $ 61  

Selling, general and administrative

     238        408  

Research and development

     39        94  
  

 

 

    

 

 

 

Total stock-based compensation

   $ 329      $ 563