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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
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,

 
    2018     2017     2018     2017  
                         
Cost of services   $ 7     $ 4     $ 15     $ 8  
Research and development     34       34       71       82  
Selling and marketing     4       5       9       11  
General and administrative     141       155       299       364  
Stock-based compensation expense   $ 186     $ 198     $ 394     $ 465