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Long - Term Investments - Components (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
Long-Term Investments |  |  |  |  |
Long -term held - to - maturity investments | ¥ 738,903 |  | ¥ 178,153 |  |
Available-for-sale investments | 332,489 | $ 332,489 |  |  |
Equity Securities without ready determinable Fair Value | 42,768 |  | 33,605 | ¥ 11,969 | ¥ 11,812
Total | 1,114,160 | $ 152,639 | ¥ 211,758 |  |
Amortized cost of available-for-sale investments | 361,819 |  |  |  |
Unrealized losses of available-for-sale securities | ¥ 29,330 |  |  |  |

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