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Intangible assets (Details 1) (USD $)
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]  
2014 $ 221,418
2015 208,918
2016 66,192
2017 66,192
2018 66,192
Thereafter 467,576
Finite-Lived Intangible Assets, Net, Total $ 1,096,488