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, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Domestic $ (139,654) $ (115,137) $ (223,991)
Foreign (12,113) (10,798) (7,283)
Total loss before income taxes $ (151,767) $ (125,935) $ (231,274)