LEASES - Lease terms and discount rates (Details) |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| LEASES | ||
| Weighted-average remaining lease term - operating leases | 2 years 9 months 18 days | 3 years 9 months 18 days |
| Weighted-average discount rate - operating leases | 5.70% | 5.70% |