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Income Taxes ((Loss) Income from Continuing Operations Before Income Taxes) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Abstract]    
United States $ (21,583,000) $ (18,341,000)
Foreign (598,000) (1,138,000)
Loss before income taxes $ (22,181,000) $ (19,479,000)