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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventories [Abstract]  
Components of inventory
The components of inventories (net) consist of the following (in thousands):

  
September 30,
2017
  
December 31,
2016
 
Finished goods
 
$
11,282
  
$
9,423
 
Work in process
  
742
   
443
 
Component parts
  
8,378
   
10,386
 
Service parts
  
6,314
   
5,985
 
  
$
26,716
  
$
26,237