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Property and Equipment (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Property and Equipment (Textual)          
Depreciation expense $ 576,000 $ 712,000 $ 1,920,000 $ 2,085,000  
Accumulated depreciation $ 6,359,000   $ 6,359,000   $ 5,936,000