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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Contracted research services $ 1,088 $ 434
Payroll and related expenses 2,733 1,182
Professional and consulting fees 3,141 984
Legal fees 320 299
Current portion of operating lease liability 937  
Total accrued expenses and other current liabilities $ 8,219 $ 2,899