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Income Taxes (Details) - Schedule of net change valuation allowance of deferred tax assets - CNY (¥) ¥ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of net change valuation allowance of deferred tax assets [Abstract] |  |  |  |
Beginning Balance | ¥ 356,294 | ¥ 279,516 | ¥ 160,252 | ¥ 81,635
Additions-change to tax expense | 22,533 | 96,599 | 119,264 | 77,553
NOL Reductions/expirations | ¥ (20,399) | (19,821) |  |
Additions- Acquisition |  |  |  | 1,064
Ending Balance |  | ¥ 356,294 | ¥ 279,516 | ¥ 160,252

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- Definition Additions- Acquisition. + References No definition available. + Details
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- Definition Amount of deferred tax assets reductions or expiration. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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