Commitments and contingencies (Details) ¥ in Thousands	Dec. 31, 2023 CNY (¥)
Aggregate future minimum rental payments under non cancelable agreement
2024	¥ 4,220

Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

Name:	us-gaap_ContractualObligationDueInSecondYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant