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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Long-Term Investments |  |  |
Equity securities without readily determinable fair value - Balances, beginning | ¥ 33,605 | ¥ 11,969 | ¥ 11,812
Equity securities without readily determinable fair value - Additions | 8,539 | 24,208 |
Equity securities without readily determinable fair value - Impairment | 0 | (2,060) | 0
Equity securities without readily determinable fair value - Foreign currency translation adjustment | 624 | (512) | 157
Equity securities without readily determinable fair value - Balances, ending | ¥ 42,768 | ¥ 33,605 | ¥ 11,969

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