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COMMITMENTS AND CONTINGENCIES - Schedule of Minimum Lease Payments Under Noncancelable Operating Leases (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2021 (remaining three months) $ 1,540  
2022 4,729  
2023 4,108  
2024 3,141  
2025 2,363  
2026 and thereafter 4,018  
Total lease payments 19,899  
Less: imputed lease interest (3,146)  
Total lease liabilities $ 16,753 $ 19,751