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ACCRUED EXPENSES (Tables)
12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Components of accrued expenses
The following table sets forth the composition of accrued expenses as of December 31, 2020 and 2019 (in thousands):
 December 31,
20202019
Research and development$1,372 $3,688 
Payroll-related expenses1,892 1,638 
Severance to former Executives and other employees— 378 
Professional fees684 378 
Other25 87 
Total Accrued Expenses
$3,973 $6,169