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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventories [Abstract]  
Inventories
The components of inventories were:

 
September 30, 2021
   
December 31, 2020
 
   
(In thousands)
 
             
Raw materials and purchased component parts
 
$
4,213
   
$
5,467
 
Finished goods
   
2,156
     
5,819
 
   
$
6,369
   
$
11,286