UNEARNED REVENUE - Narrative (Details) - USD ($) $ in Thousands |
9 Months Ended | |
|---|---|---|
Sep. 30, 2021 |
Dec. 31, 2020 |
|
| UNEARNED REVENUE | ||
| Long-term unearned revenue | $ 23,100 | $ 18,000 |
| Long-term unearned revenue, recognition period (or less) | 5 years |
| X | ||||||||||
- Definition Contract With Customer, Liability, Recognition Period No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|