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Long-term Investment (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Long-term Investment |  |
Time deposit | $ 186,751 |
Investments in available-for-sale debt securities | 9,874 | $ 17,665
U.S. treasury securities | 10,140 |
Investments in equity securities accounted for under alternative measurement | 488 |
Investment in an equity security with readily determinable fair values | 236 | 366
Total long-term investments | $ 207,489 | $ 18,031

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