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Inventories
 3 Months Ended
Mar. 31, 2023
Inventories [Abstract]  
Inventories
4. Inventories

The components of inventories were:

 
March 31, 2023
    
December 31, 2022
  
   
(In thousands)
  
             
Raw materials and purchased component parts
  
$
9,720
    
$
8,884
  
Finished goods
    
2,670
      
3,144
  
   
$
12,390
    
$
12,028