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Intangible assets - Schedule of Estimated Future Amortization Expense (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Intangible Assets, Net (Excluding Goodwill) [Abstract]      
2013 $ 59,917 $ 80,937  
2014 124,575 119,758  
2015 124,575 119,758  
2016 124,575 119,758  
2017 118,378 113,560  
Thereafter 417,757 399,556  
Intangible assets, net $ 969,777 $ 953,327 $ 372,020