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Intangible Assets, net - Impairment loss (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Intangible assets, net |  |  |
Total impairment loss | ¥ 648 | ¥ 2,945 | ¥ 0
Selling, general and administrative expenses |  |  |
Intangible assets, net |  |  |
Total impairment loss | 648 | 2,662 | 0
Research and development expenses |  |  |
Intangible assets, net |  |  |
Total impairment loss | ¥ 0 | ¥ 283 | ¥ 0

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