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Income Taxes (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Income Tax Disclosure [Abstract]          
Income tax expense $ 76,000 $ 448,000 $ 1,502,000 $ 953,000  
Unrecognized tax benefits $ 0   $ 0   $ 0