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Income tax - Movement of valuation allowance and tax losses carry forwards (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income tax |  |  |
Balance at the beginning of the year | ¥ 526,645 | ¥ 376,933 | ¥ 159,820
Additions | 49,008 | 149,712 | 217,113
Loss utilized | (234) |  |
Balance at the end of the year | ¥ 575,419 | ¥ 526,645 | ¥ 376,933

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- References No definition available. + Details
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- Definition Amount of increase in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Amount of change in the valuation allowance from loss utilized for a specified deferred tax asset. + References No definition available. + Details
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