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Intangible Assets (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]        
Amortization of Intangible Assets $ 58,000 $ 58,000 $ 175,000 $ 175,000