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Intangible Assets (Details 1) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Estimated amortization expense of intangible assets    
2013 (remaining nine months) $ 113,557  
2014 150,493  
2015 141,743  
2016 134,672  
2017 131,098  
2018 121,501  
Thereafter 649,633  
Net Carrying Amount $ 1,442,697 $ 1,463,059