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Employee Retirement and Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Text Block [Abstract]  
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      For the Nine Months  
     Ended September 30,      Ended September 30,  
     2017      2016      2017      2016  

Cost of service revenue

    $ 542      $ 446      $ 1,332      $ 1,142  

Cost of equipment revenue

      49        34        136        78  

Engineering, design and development

      897        970        2,801        2,432  

Sales and marketing

      1,305        1,498        3,473        3,799  

General and administrative

      2,490        2,052        7,265        5,535  
  

 

 

     

 

 

     

 

 

     

 

 

  

Total stock-based compensation expense

    $ 5,283      $ 5,000      $ 15,007      $ 12,986