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FAIR VALUE MEASUREMENT - Marketable securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
FAIR VALUE MEASUREMENT |  |  |
Carried at fair value | $ 15,190 | $ 18,337 |
Fair value (gain) losses | 2,826 | 418 | $ 4,744
Other Long-Term Investments | 22,869 | 7,134 |
Unrealized gains | 15,500 | 1,810 |
Carried at fair value | 4,134 | 3,739 |
Gain of investments | $ 3,487 | $ 904 |

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