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Details of Consolidated Revenue and Revenue by Geographic Region (Details 1) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Revenue, Net $ 18,463,872 $ 22,114,839 $ 55,956,617 $ 60,163,145
North America [Member]        
Segment Reporting Information [Line Items]        
Revenue, Net 17,342,443 20,867,324 52,664,719 56,360,870
Europe [Member]        
Segment Reporting Information [Line Items]        
Revenue, Net $ 1,121,429 $ 1,247,515 $ 3,291,898 $ 3,802,275