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Taxation - Movement of Deferred Tax Valuation Allowance (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Balance at beginning of the year | ¥ 367,884 | ¥ 344,165 |
Additions, net of foreign exchange impacts | (105,629) | 23,719 | ¥ 27,805
Balance at end of the year | ¥ 262,255 | ¥ 367,884 | ¥ 344,165

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- 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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