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INCOME TAXES - Components of (Loss) before (Benefit From) Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Domestic $ (59,281) $ (51,396) $ (27,494)
Foreign (65,608) (83,450) 15,951
(Loss) before (benefit from) income taxes $ (124,889) $ (134,846) $ (11,543)