Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Schedule of Income before Income Tax, Domestic and Foreign (Details)

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INCOME TAXES - Schedule of Income before Income Tax, Domestic and Foreign (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Domestic $ (202,831) $ (139,654) $ (115,137)
Foreign (7,865) (12,113) (10,798)
Loss before income taxes $ (210,696) $ (151,767) $ (125,935)