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Share-based compensation - Share-based compensation expense (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based compensation recognized in operating expenses |  |  |
Total share-based compensation expenses | ¥ 17,393 | ¥ 31,899 | ¥ 183,349
Fulfillment |  |  |
Share-based compensation recognized in operating expenses |  |  |
Total share-based compensation expenses | 195 | 585 | 2,154
Sales and marketing |  |  |
Share-based compensation recognized in operating expenses |  |  |
Total share-based compensation expenses | 4,682 | 5,935 | 8,204
Research and development |  |  |
Share-based compensation recognized in operating expenses |  |  |
Total share-based compensation expenses | 3,070 | 3,883 | 10,134
General and administrative |  |  |
Share-based compensation recognized in operating expenses |  |  |
Total share-based compensation expenses | ¥ 9,446 | ¥ 21,496 | ¥ 162,857

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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