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LEASES - Supplemental balance sheet information related to leases (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
LEASES |  |
Operating lease right-of-use assets | $ 5,909 | $ 6,572
Current operating lease liabilities | $ 2,550 | $ 3,013
Current operating lease liabilities, Statement of Financial Position | us-gaap:AccruedLiabilitiesAndOtherLiabilities | us-gaap:AccruedLiabilitiesAndOtherLiabilities
Non-current operating lease liabilities | $ 4,332 | $ 5,013
Total operating lease liabilities | 6,882 | 8,026
Finance lease right-of-use assets | 197 | 76
Current finance lease liabilities | $ 95 | $ 38
Current finance lease liabilities, Statement of Financial Position | us-gaap:AccruedLiabilitiesAndOtherLiabilities | us-gaap:AccruedLiabilitiesAndOtherLiabilities
Non-current finance lease liabilities | $ 101 | $ 36
Total finance lease liabilities | $ 196 | $ 74
Weighted average remaining lease term (in years) - Operating leases | 3 years 7 months 6 days | 4 years 2 months 12 days
Weighted average remaining lease term (in years) - Finance leases | 2 years 7 months 6 days | 2 years 1 month 6 days
Weighted average discount rate (as a percentage) - Operating leases | 7.10% | 7.70%
Weighted average discount rate (as a percentage) - Finance leases | 4.40% | 7.90%

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