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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2016
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]  
Schedule of stock-based employee compensation expense included in unaudited consolidated statements of comprehensive income
   

Three Months Ended

June 30,

    

Six Months Ended

June 30,

  
    2016     2015     2016     2015  
                         
Cost of services   $ 3     $ 12     $ 3     $ 13  
Research and development     28       26       30       27  
Selling and marketing     4       4       4       5  
General and administrative     147       179       153       197  
Stock-based compensation expense   $ 182     $ 221     $ 190     $ 242