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Property and Equipment, Net | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property and Equipment, Net |
6. | Property and Equipment, Net
The following is a summary of property and equipment, net:
|  | December 31, 2018 |  |  | December 31, 2019 |  |  | December 31, 2020 |
|  | RMB in thousands |
Leasehold improvements |  |  | 51,186 |  |  |  | 76,772 |  |  |  | 118,581 |
Servers and computers |  |  | 481,695 |  |  |  | 765,110 |  |  |  | 1,286,310 |
Others |  |  | 19,127 |  |  |  | 23,211 |  |  |  | 30,750 |
Total |  |  | 552,008 |  |  |  | 865,093 |  |  |  | 1,435,641 |
Less: accumulated depreciation |  |  | (157,110 | ) |  |  | (349,006 | ) |  |  | (673,700 | )
Net book value |  |  | 394,898 |  |  |  | 516,087 |  |  |  | 761,941 |
Depreciation expenses were RMB99.7 million, RMB191.8 million and RMB326.5 million for the years ended December 31, 2018, 2019 and 2020, respectively. The Group had performed the impairment assessment of property and equipment and considered the relevant events and circumstances that might indicate potential impairment and concluded that there was no impairment indicator. No impairment charge was recognized for any of periods presented.

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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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