BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details) - USD ($) $ in Millions |
9 Months Ended | 12 Months Ended |
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Sep. 30, 2021 |
Dec. 31, 2020 |
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| BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | ||
| Allowance for doubtful accounts | $ 0.1 | $ 0.1 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of expense related to credit loss from transactions other than loan and lease transactions. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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