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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Research and development $ 5,145 $ 3,688
Payroll-related expenses 1,474 1,638
Severance to former Executives and other employees 0 378
Professional fees 1,060 378
Other 24 87
Total Accrued Expenses $ 7,703 $ 6,169