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Income taxes - Net operating loss carryforwards (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Other than PRC |  |
Net operating loss carryforwards |  |
Net operating loss carryforwards | ¥ 87,051 | ¥ 11,893
PRC |  |
Net operating loss carryforwards |  |
2026 | 8,118 |
2027 | 648,012 |
Net operating loss carryforwards | ¥ 656,130 |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws expiring in year 2026. + References No definition available. + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws expiring in year 2027 to 2031. + References No definition available. + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
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