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Significant Accounting Policies (Details) - Schedule of intangible assets are amortized using the straight-line | 12 Months Ended
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Dec. 31, 2020
Brand name [Member] |
Finite-Lived Intangible Assets [Line Items] |
Finite Lived Intangible Asset Estimated Useful Life | 5 years
Customer relationship [Member] | Minimum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Finite Lived Intangible Asset Estimated Useful Life | 3 years
Customer relationship [Member] | Maximum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Finite Lived Intangible Asset Estimated Useful Life | 5 years
Software [Member] |
Finite-Lived Intangible Assets [Line Items] |
Finite Lived Intangible Asset Estimated Useful Life | 5 years
Patent [Member] |
Finite-Lived Intangible Assets [Line Items] |
Finite Lived Intangible Asset Estimated Useful Life | 19 years

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=uk_BrandNameMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=uk_SoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_PatentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |