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Accounts Receivable, Net (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] |
Schedule of Accounts Receivable, Net |
|  | As at December 31 |
|  | 2020 |  |  | 2021 |  |  | 2021 |
|  | RMB |  |  | RMB |  |  | US$ |
Accounts receivable |  |  | 2,350,641 |  |  |  | 3,603,240 |  |  |  | 565,427 |
Allowance for credit losses |  |  | (15,770 | ) |  |  | (32,265 | ) |  |  | (5,063 | )
Accounts receivable, net |  |  | 2,334,871 |  |  |  | 3,570,975 |  |  |  | 560,364 |
Schedule of the Movement in the allowance for Doubtful Accounts | The movements of the allowance for credit losses were as follows:
|  | As at December 31 |
|  | 2019 |  |  | 2020 |  |  | 2021 |  |  | 2021 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Balance at beginning of the year |  |  | 2,249 |  |  |  | 22,894 |  |  |  | 15,770 |  |  |  | 2,475 |
Adoption of ASC 326* |  |  | — |  |  |  | — |  |  |  | 5,684 |  |  |  | 892 |
Provision for expected credit losses |  |  | 61,687 |  |  |  | 44,695 |  |  |  | 121,731 |  |  |  | 19,102 |
Write-offs charged against the allowance |  |  | (41,042 | ) |  |  | (44,096 | ) |  |  | (101,202 | ) |  |  | (15,881 | )
Recoveries during the year |  |  | — |  |  |  | (7,723 | ) |  |  | (9,718 | ) |  |  | (1,525 | )
Balance at end of the year |  |  | 22,894 |  |  |  | 15,770 |  |  |  | 32,265 |  |  |  | 5,063 |
* | Starting from January 1, 2021, the Group adopted ASC 326, which amends previously issued the guidance regarding the impairment of financial instruments by creating an impairment model that is based on expected losses rather than incurred losses. The Group used a modified retrospective approach with a cumulative effect of increasing the opening balance of accumulated deficit approximately of RMB5,684 (US$892).

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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