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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 |
7. | PROPERTY AND EQUIPMENT, NET
Property and equipment consist of the following:
|  | As of December 31, |
|  | 2020 |  |  | 2021 |
|  | RMB |  |  | RMB |  |  | US$ |
At cost: |  |  |  |  |  |  |  |  |  |  |  |
Electronic equipment |  |  | 647,271 |  |  |  | 651,779 |  |  |  | 102,278 |
Office equipment |  |  | 5,841 |  |  |  | 2,290 |  |  |  | 359 |
Motor vehicles |  |  | 7,071 |  |  |  | 7,264 |  |  |  | 1,140 |
Software |  |  | 305,552 |  |  |  | 419,326 |  |  |  | 65,801 |
Leasehold improvements |  |  | 96,211 |  |  |  | 87,718 |  |  |  | 13,766 |
|  |  | 1,061,946 |  |  |  | 1,168,377 |  |  |  | 183,344 |
Less: Accumulated depreciation |  |  | (651,865 | ) |  |  | (786,881 | ) |  |  | (123,479 | )
|  |  | 410,081 |  |  |  | 381,496 |  |  |  | 59,865 |
Depreciation expense was RMB106,941, RMB158,229 and RMB225,310 (US$35,356) for the years ended December 31, 2019, 2020 and 2021, 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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