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Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock-Based Compensation Expense Related to Stock Options

Stock-based compensation expense related to stock options is included in the following line items in the accompanying statements of operations:

 

     Three Months Ended March 31,  
             2014                      2013          

Cost of revenue

   $ 13       $ 11   

Research and development

     62         7   

Selling, general and administrative

     35         24   
  

 

 

    

 

 

 
   $ 110       $ 42