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Property and Equipment (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Property and Equipment (Textual)        
Depreciation and amortization expense $ 490,483 $ 414,674 $ 1,387,149 $ 1,178,972