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INCOME TAXES - Schedule of Income (Loss) Before Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Loss before income taxes:      
United States $ (132,887) $ (52,569) $ (55,932)
Foreign 9,994 (20,841) 2,240
Loss before income taxes $ (122,893) $ (73,410) $ (53,692)