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Intangible assets, net - Narratives (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Intangible assets, net      
Amortization expenses ¥ 8,857 ¥ 8,198 ¥ 6,387
Impairment Charges ¥ 0 ¥ 0 ¥ 0