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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]          
Patents, trademarks and applications, net of accumulated amortization $ 943,475   $ 943,475   $ 1,136,410
Goodwill 387,239   387,239   387,239
Total other long-term assets 1,330,714   1,330,714   1,523,649
Finite-lived assets, accumulated amortization 554,967   554,967   $ 548,327
Future amortization          
2016 81,000   81,000    
2017 81,000   81,000    
2018 81,000   81,000    
2019 81,000   81,000    
2020 81,000   81,000    
Impairment charges $ 34,000 $ 5,000 $ 168,000 $ 5,000