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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventories [Abstract]  
Inventories
The components of inventories are:

 
December 31,
 
(In thousands)
 
2021
   
2020
 
Raw materials and purchased component parts
 
$
6,479
   
$
5,467
 
Work-in-process
   
11
     
 
Finished goods
   
1,230
     
5,819
 
   
$
7,720
   
$
11,286