SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of geographic information for long-lived assets (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Total | $ 345,736 | $ 460,476 |
| PRC | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Total | 318,015 | 407,386 |
| UK | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Total | 11,889 | 31,127 |
| European Union countries | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Total | $ 15,832 | $ 21,963 |