SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Financial instruments and fair value measurements (Details) - Nonrecurring - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Carrying Value | ||
| Liabilities: | ||
| Long-term investments | $ 77 | $ 73 |
| Level 3 | Fair Value | ||
| Liabilities: | ||
| Long-term investments | $ 77 | $ 73 |