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Income Taxes, Loss Before Income Tax (Benefit) Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]      
United States $ (69,576) $ (5,289) $ (57,466)
Foreign (6,580) (11,474) 0
Loss before income tax benefit (expense) $ (76,156) $ (16,763) $ (57,466)