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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
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

September 30,

    

Nine Months Ended

September 30,

  
    2017     2016     2017     2016  
                         
Cost of services   $ 4     $ 2     $ 8     $ 5  
Research and development     34       29       82       59  
Selling and marketing     5       4       11       7  
General and administrative     155       149       364       303  
Stock-based compensation expense   $ 198     $ 184     $ 465     $ 374