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Intangible Assets
12 Months Ended
Dec. 31, 2015
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):

 

     2015      2014  

Patent costs

   $ 2,525       $ 2,721   

Accumulated amortization

     (1,583      (1,689
  

 

 

    

 

 

 
   $ 942       $ 1,032   
  

 

 

    

 

 

 

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

Patent renewal fees were $64,000 and $25,000 in 2015 and 2014, respectively.

Amortization expense was approximately $145,000, $170,000 and $264,000 in 2015, 2014 and 2013, respectively. The estimated future amortization expense from patent assets held as of December 31, 2015, is projected to be $133,000, $127,000, $111,000, $105,000 and $100,000, in fiscal years 2016, 2017, 2018, 2019, and 2020, respectively.