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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Employee compensation and related costs $ 55,589 $ 27,166
Professional fees 14,368 13,331
Other 63,918 16,203
Total accrued expenses $ 133,875 $ 56,700