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Employee Retirement and Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
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Summary of Stock-Based Compensation Expense by Operating Expense

The following is a summary of our stock-based compensation expense by operating expense line in the unaudited condensed consolidated statements of operations (in thousands):

 

     For the Three Months  
     Ended March 31,  
     2018      2017  

Cost of service revenue

    $ 434      $ 458  

Cost of equipment revenue

      54        37  

Engineering, design and development

      910        850  

Sales and marketing

      1,082        749  

General and administrative

      1,906        2,236  
  

 

 

     

 

 

  

Total stock-based compensation expense

    $ 4,386      $ 4,330