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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventories [Abstract]  
Components of inventory
The components of inventories, net are:

 
September 30, 2017
  
December 31, 2016
 
 
(In thousands)
 
 
     
Raw materials and purchased component parts
 
$
6,525
   
$
6,298
 
Work-in-process
  
1
    
8
 
Finished goods
  
1,645
    
3,401
 
 
 
$
8,171
   
$
9,707