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Revenue information - Narrative (Details) - CNY (¥)
¥ in Thousands
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]    
Revenue recognized from contract liabilities ¥ 99,258 ¥ 101,443
The PRC, excluding Hong Kong S.A.R. | Total revenues | Geographic Concentration Risk    
Disaggregation of Revenue [Line Items]    
Concentration risk percentage 97.60% 97.20%