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Significant Accounting Policies - Movements of the allowance for doubtful accounts (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at January 1 | ¥ 292,473 |  | ¥ 121,003 | ¥ 35,596
Provisions | 130,549 | $ 18,928 | 189,165 | 99,165
Write-offs | (117,487) |  | (17,695) | (13,758)
Balance at December 31 | ¥ 305,535 |  | ¥ 292,473 | 121,003
Accounting Standards Update 2016-13 [Member] |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at January 1 |  |  |  | 17,900
Previously Reported [Member] |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at January 1 |  |  |  | ¥ 17,696

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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