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Share-based compensation - Unrecognized compensation expenses (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Share-based compensation |  |
Unrecognized compensation expenses | ¥ 166,224 | ¥ 14,395
Unrecognized compensation expenses which is expected to be recognized over a weighted-average period | 3 years 9 months 18 days | 3 years 1 month 20 days

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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