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Intangible Assets
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets

10.  INTANGIBLE ASSETS

Patent costs, which are included in other assets in the accompanying Consolidated Balance Sheets, as of December 31 were as follows (in thousands):

 

     2017      2016  

Patent costs

   $ 2,093    $ 2,427

Accumulated amortization

     (1,386      (1,598
  

 

 

    

 

 

 
   $ 707    $ 829
  

 

 

    

 

 

 

Definite lived intangible assets, such as patent rights, are amortized and tested for impairment if a triggering event occurs.

Amortization expense was approximately $130,000, $134,000 and $145,000 in 2017, 2016 and 2015, respectively. The estimated future amortization expense from patent assets held as of December 31, 2017, is projected to be $112,000, $107,000, $102,000, $93,000 and $61,000, in fiscal years 2018, 2019, 2020, 2021, and 2022, respectively.