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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Research and development $ 3,517 $ 3,688
Payroll-related expenses 627 1,638
Severance to former Executives and other employees 155 378
Professional fees 544 378
Other 50 87
Total Accrued Expenses $ 4,893 $ 6,169