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Intangible Assets
12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets

10.  INTANGIBLE ASSETS

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

 

     2016      2015  

Patent costs

   $ 2,427      $ 2,525  

Accumulated amortization

     (1,598      (1,583
  

 

 

    

 

 

 
   $ 829      $ 942  
  

 

 

    

 

 

 

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

Amortization expense was approximately $134,000, $145,000 and $170,000 in 2016, 2015 and 2014, respectively. The estimated future amortization expense from patent assets held as of December 31, 2016, is projected to be $129,000, $113,000, $106,000, $102,000 and $92,000, in fiscal years 2017, 2018, 2019, 2020, and 2021, respectively.