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Property and Equipment, Net | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property and Equipment, Net |
8. | PROPERTY AND EQUIPMENT, NET
|  | As at December 31 |
|  | 2020 |  |  | 2021 |  |  | 2021 |
|  | RMB |  |  | RMB |  |  | US$ |
Electronic equipment |  |  | 4,164,384 |  |  |  | 5,123,149 |  |  |  | 803,934 |
Office equipment and fixtures |  |  | 9,759 |  |  |  | 15,462 |  |  |  | 2,426 |
Data center machinery and equipment |  |  | 135,068 |  |  |  | 144,328 |  |  |  | 22,648 |
Building |  |  | — |  |  |  | 15,768 |  |  |  | 2,474 |
Construction in progress |  |  | 5,454 |  |  |  | 147,817 |  |  |  | 23,196 |
|  |  | 4,314,665 |  |  |  | 5,446,524 |  |  |  | 854,678 |
Less: accumulated depreciation |  |  | (2,357,875 | ) |  |  | (3,082,421 | ) |  |  | (483,699 | )
Property and equipment, net |  |  | 1,956,790 |  |  |  | 2,364,103 |  |  |  | 370,979 |
Depreciation expense for the years ended December 31, 2019, 2020 and 2021 was RMB601,730, RMB750,375 and RMB783,305 (US$122,918), respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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