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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Patents [Member]  
Schedule of Patent Cost and Other Asset

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