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Property and Equipment (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Line Items]        
Depreciation, Depletion and Amortization     $ 2,558 $ 2,771
Property, Plant and Equipment [Member]        
Property, Plant and Equipment [Line Items]        
Depreciation, Depletion and Amortization $ 500 $ 600 $ 1,700 $ 1,900