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Income taxes - Net operating loss carryforwards (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other than PRC
Net operating loss carryforwards
Total	¥ 302,595	¥ 87,051
PRC
Net operating loss carryforwards
2026	7,450
2027	145,626
2028	112,976
2031	668
2032	571,961
2033	601,622
Total	¥ 1,440,303

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-3

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