SUMMARY OF MATERIAL ACCOUNTING POLICIES - Goodwill and intangible assets (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Software | Minimum | |
| SUMMARY OF MATERIAL ACCOUNTING POLICIES | |
| Estimated useful lives of intangible assets with finite lives | 3 years |
| Software | Maximum | |
| SUMMARY OF MATERIAL ACCOUNTING POLICIES | |
| Estimated useful lives of intangible assets with finite lives | 7 years |
| Customer relationships and other | Minimum | |
| SUMMARY OF MATERIAL ACCOUNTING POLICIES | |
| Estimated useful lives of intangible assets with finite lives | 5 years |
| Customer relationships and other | Maximum | |
| SUMMARY OF MATERIAL ACCOUNTING POLICIES | |
| Estimated useful lives of intangible assets with finite lives | 8 years |