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Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]          
Goodwill associated with the Company's purchase and other past acquisitions $ 38,201   $ 38,201   $ 38,201
Aggregate amortization expense $ 327 $ 355 $ 654 $ 709