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Property and Equipment, Net (Details) - CNY (¥) ¥ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Abstract] |  |  |  |  |
Depreciation expenses | ¥ 39,125 | ¥ 24 | ¥ 76,353 | ¥ 108,303 | ¥ 79,162
Loss on disposal | ¥ 21,313 | ¥ 72,025 | ¥ 138,827 | ¥ 30,604 | ¥ 7,069
Property and equipment, description | The building located in Kaifeng, Henan Province, with carrying amount of RMB 45,777 as of June 30, 2021, was pledged for a 2-year RMB9,800 bank loan which was borrowed in July, 2020. |  | The Building located in Kaifeng, Henan Province, was pledged for a 2-year RMB9,800 bank loan which was borrowed in July, 2020. |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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