Quarterly report pursuant to Section 13 or 15(d)

Other long-term assets (Details)

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Other long-term assets (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Other long-term assets [Abstract]          
Patents, trademarks and applications, net of accumulated amortization $ 1,287,215   $ 1,287,215   $ 1,214,797
Goodwill 387,239   387,239   387,239
Other           10,124
Total other long-term assets 1,674,454   1,674,454   1,612,160
Finite-lived assets, accumulated amortization 463,147   463,147   422,261
Amortization expense 21,000 22,000 41,000 41,000  
Future amortization          
2014 81,000   81,000    
2015 81,000   81,000    
2016 81,000   81,000    
2017 81,000   81,000    
2018 81,000   81,000    
Impairment charges    $ 3,000    $ 2,951