XML 137 R107.htm IDEA: XBRL DOCUMENT
v3.21.1

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

X
- Definition Additions- Acquisition. + References No definition available. + Details
Name: | uk_DeferredTaxAssetAdditionsAcquisition
Namespace Prefix: | uk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of deferred tax assets reductions or expiration. + References No definition available. + Details
Name: | uk_DeferredTaxAssetsValuationAllowanceReductions
Namespace Prefix: | uk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | uk_ScheduleOfNetChangeValuationAllowanceOfDeferredTaxAssetsAbstract
Namespace Prefix: | uk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration