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Intangible assets, net
 12 Months Ended
Dec. 31, 2021
Intangible assets, net [Abstract]  
Intangible assets, net
6. 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,
  
   
2021
    
2020
  
 
(In thousands)
  
Gross Amount
    
Accumulated Amortization
    
Gross Amount
    
Accumulated Amortization
  
Purchased technology
  
$
1,591
    
$
(1,195
)
  
$
2,526
    
$
(1,975
)
Customer relationships
    
–
      
–
      
1,300
      
(1,300
)
Trademark
    
–
      
–
      
480
      
(450
)
Covenant not to compete
    
–
      
–
      
146
      
(146
)
Patents
    
15
      
(14
)
    
56
      
(54
)
Other
    
–
      
–
      
80
      
(80
)
Total
  
$
1,606
    
$
(1,209
)
  
$
4,588
    
$
(4,005
)

Amortization expense was $186 thousand and $234 thousand in 2021 and 2020, respectively.  Amortization expense for each of the next five years ending December 31 is expected to be as follows: $155 thousand in 2022; $154 thousand in 2023; $88 thousand in 2024; and none thereafter.