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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Other long-term assets [Abstract]          
Patents, trademarks and applications, net of accumulated amortization $ 1,327,047   $ 1,327,047   $ 1,336,951
Goodwill 387,239   387,239   387,239
Total other long-term assets 1,714,286   1,714,286   1,724,190
Finite-lived assets, accumulated amortization 559,922   559,922   $ 507,644
Future amortization          
2015 97,000   97,000    
2016 97,000   97,000    
2017 97,000   97,000    
2018 97,000   97,000    
2019 97,000   97,000    
Impairment charges $ 5,000   $ 5,000