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Income Taxes - Components of Net Loss Before Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract]      
United States $ (64,076) $ (70,176) $ (56,178)
Foreign (5,406) (9,254) (10,681)
Net loss before income taxes $ (69,482) $ (79,430) $ (66,859)