LEASES - Lease Terms and Discount Rates (Details) - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended | |
|---|---|---|---|
Sep. 30, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| LEASES | |||
| Weighted average remaining lease term: Operating leases (in years) | 0 years | 6 months | |
| Weighted average remaining lease term: Financing leases (in years) | 3 years 1 month 6 days | 3 years 3 months 18 days | |
| Weighted average discount rate: Operating leases (as a percent) | 6.90% | ||
| Weighted average discount rate: Financing leases (as a percent) | 8.10% | 7.90% | |
| ROU assets acquired in exchange for finance lease liabilities | $ 431 | $ 513 | $ 586 |
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- Definition Weighted average discount rate for finance lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Weighted average discount rate for operating lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of increase in right-of-use asset obtained in exchange for finance lease liability. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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