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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%

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