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COMMITMENTS AND CONTINGENCIES - Lease Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]    
Operating lease liabilities, current (Accrued liabilities) $ 4,603 $ 4,542
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Operating lease liabilities, noncurrent (Other liabilities) $ 12,915 $ 15,209
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Total operating lease liabilities $ 17,518 $ 19,751
Weighted average remaining lease term 6 years 2 months 12 days 6 years 4 months 24 days
Weighted average discount rate 7.60% 7.70%