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Inventories
 6 Months Ended
Jun. 30, 2018
Inventories [Abstract]  
Inventories
2. Inventories, net

The components of inventories, net are:

 
June 30, 2018
 
December 31, 2017
 
 
(In thousands)
 
 
    
Raw materials and purchased component parts
 
$
8,886
  
$
6,322
 
Finished goods
  
2,496
   
2,553
 
 
 
$
11,382
  
$
8,875