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Intangible assets, net
 12 Months Ended
Dec. 31, 2023
Intangible assets, net [Abstract]  
Intangible assets, net
5. Intangible assets, net

Identifiable intangible assets are recorded in Intangible assets, net in the accompanying Consolidated Balance Sheets and are comprised of the following:

 
December 31,
  
   
2023
    
2022
  
 
(In thousands)
  
Gross Amount
    
Accumulated Amortization
    
Gross Amount
    
Accumulated Amortization
  
Purchased technology
  
$
1,591
    
$
(1,503
)
  
$
1,591
    
$
(1,349
)
Patents
    
15
      
(15
)
    
15
      
(15
)
Total
  
$
1,606
    
$
(1,518
)
  
$
1,606
    
$
(1,364
)

Amortization expense was $154 thousand and $155 thousand in 2023 and 2022, respectively.  Amortization expense for each of the next five years ending December 31 is expected to be as follows: $88 thousand in 2024; and none thereafter.