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Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Other Intangible Assets

The components of our other intangible assets at December 31, 2015 are summarized below:

 

Other Intangible Asset Class

   Cost     Accumulated
Amortization		     Write Off/
Impairment		     Net Carrying
Amount		     Weighted-
Average
Amortization
Period		  

Patents

     1,243,612        (958,555 )      (239,241 )     45,816        17.0 years   
 

 

 

    

 

 

    

 

 

    

 

 

    

 

 

  
Expected Future Annual Amortization Expense

The expected future annual amortization expense for each of the next five years based on current balances of our intangible assets is as follows:

 

For the year ending December 31:

   

2016

    $ 29,529   

2017

    $ 16,287   

2018

    $ —    

2019

    $ —    

2020

    $ —