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Fair value measurement (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair value measurement
Gross unrealized gains	¥ 0	¥ 0	¥ 0
Recurring basis
Fair value measurement
Assets measured at fair value	874,210	0
Liability measured at fair value	¥ 0	¥ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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Fair value of financial and nonfinancial obligations.

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