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Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventories, net [Abstract]  
Inventories
The components of inventories were:

 
March 31, 2021
   
December 31, 2020
 
   
(In thousands)
 
             
Raw materials and purchased component parts
 
$
4,672
   
$
5,467
 
Finished goods
   
5,328
     
5,819
 
   
$
10,000
   
$
11,286