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Other long-term assets (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Other long-term assets [Abstract]      
Patents, trademarks and applications, net of accumulated amortization of $364,479 and $345,692 $ 1,221,195   $ 1,210,698
Goodwill 387,239   387,239
Other 2,530   3,957
Total other long-term assets 1,610,964   1,601,894
Finite-lived assets, accumulated amortization 364,479   345,692
2013 75,000    
2014 75,000    
2015 75,000    
2016 75,000    
2017 75,000    
Impairment charges    $ 41,950