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ACCRUED EXPENSES (Tables)
12 Months Ended
Dec. 31, 2021
Payables and Accruals [Abstract]  
Schedule of Accrued Expenses Accrued expenses and other current liabilities consisted of the following:
December 31,

2021

2020
Contracted research services$12,192 $5,102 
Payroll and related expenses5,088 3,729 
Professional and consulting fees1,852 1,603 
Legal fees83 199 
Current portion of operating lease liability320 1,047 
Total accrued expenses and other current liabilities$19,535 $11,680