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Fair Value Measurement - Assets or liabilities (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 USD ($)
--- | --- | --- | ---
Assets |  |  |
Investments under fair value option | $ 584,773 |  | $ 1,668,550
Available-for-sale investments | 332,489 | ¥ 332,489 |
Total Assets | 917,262 |  | 1,668,550
Level 2 |  |  |
Assets |  |  |
Investments under fair value option | 584,773 |  | 1,668,550
Available-for-sale investments | 332,489 |  |
Total Assets | $ 917,262 |  | $ 1,668,550

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