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Details of Consolidated Revenue and Revenue by Geographic Region (Details 1) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Revenue, Net $ 18,880,506 $ 17,539,666 $ 37,492,745 $ 38,048,306
North America [Member]        
Segment Reporting Information [Line Items]        
Revenue, Net 17,759,180 16,319,805 35,322,276 35,493,546
Europe [Member]        
Segment Reporting Information [Line Items]        
Revenue, Net $ 1,121,326 $ 1,219,861 $ 2,170,469 $ 2,554,760