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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Schedule of Accounts Payable and Accrued Liabilities
Accrued expenses and other current liabilities consist of the following:
September 30,
2021		December 31,
2020
Compensation and related benefits
$8,803 $6,953 
Professional services
2,805 1,787 
Research and development costs
1,484 355 
Milestone payment1,000 — 
Deferred offering costs
1,970 — 
Other
940 473 
Total
$17,002 $9,568 
Accrued expenses and other current liabilities consist of the following:
December 31,
20202019
Compensation and related benefits
$6,953 $5,496 
Professional services
1,787 76 
Research and development costs
355 288 
Other
473 468 
Total
$9,568 $6,328