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Income Taxes (Domestic and Foreign Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
United States $ (76,758) $ (80,034) $ (10,025)
Foreign (178) (623) (1,367)
Loss before income taxes $ (76,936) $ (80,657) $ (11,392)