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COMMITMENTS AND CONTINGENCIES - Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]    
Operating lease liabilities, current (Accrued liabilities) $ 4,261 $ 4,542
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accrued Liabilities, Current Accrued Liabilities, Current
Operating lease liabilities, noncurrent (Other liabilities) $ 12,492 $ 15,209
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Noncurrent Other Liabilities, Noncurrent
Total operating lease liabilities $ 16,753 $ 19,751
Weighted average remaining lease term 6 years 6 years 4 months 24 days
Weighted average discount rate 7.50% 7.70%