PRINCIPAL ACCOUNTING POLICIES - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands |
Jun. 30, 2025 |
Dec. 31, 2024 |
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| Assets: | ||
| Short-term investments | $ 210 | $ 105,135 |
| Fair Value, Recurring | ||
| Assets: | ||
| Investments at fair value, available-for-sale debt securities | 34,468 | 30,824 |
| Fair Value, Recurring | Level 3 | ||
| Assets: | ||
| Investments at fair value, available-for-sale debt securities | $ 34,468 | $ 30,824 |
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- References No definition available.
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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