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Intangible Assets (Tables) (Patents [Member])
 12 Months Ended
Dec. 31, 2014
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):

 

     2014      2013  

Patent costs

    $ 2,721      $ 3,170  

Accumulated amortization

      (1,689 )       (2,007 ) 
  

 

 

     

 

 

  
$ 1,032   $ 1,163