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Intangible Assets
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
7.  INTANGIBLE ASSETS
Patent costs, which are included in Other assets in the accompanying Conso
lidated
Balance Sheets,
as
of December 31 were as follows (in thousands):
 
 
  
2022
 
  
2021
 
Patent costs
    $ 1,030      $ 1,686  
Accumulated amortization
      (772 )       (1,354 ) 
    
 
 
     
 
 
  
     $ 258      $ 332  
    
 
 
     
 
 
  
 
 
Definite lived intangible assets, such as patent rights, are amortized and tested for impairment if a triggering event occurs.
As of December 31, 2022, we had $3,202,000 of capitalized
internal-use
so
ftw
are costs which have not been amortized as the software has not yet been placed in service.
Amortization expense was approximately $75,000, $96,000 and $106,000 in 2022,
2021, and 2020, respectively.