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Long-Term Investments - Summary of long-term investments (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Long-Term Investments. |  |  |
Equity securities without readily determinable fair value - Balances, beginning | ¥ 11,969 | ¥ 11,812 | ¥ 2,741
Equity securities without readily determinable fair value - Additions | 24,208 |  | 9,900
Equity securities without readily determinable fair value - Impairment | (2,060) | 0 | (784)
Equity securities without readily determinable fair value - Foreign currency translation adjustment | (512) | (157) | 45
Equity securities without readily determinable fair value - Balances, ending | ¥ 33,605 | ¥ 11,969 | ¥ 11,812

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