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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Patents [Member]  
Schedule of Patent Cost and Other Asset

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