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Commitments and Contingencies (Details) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)
Commitments and Contingencies Disclosure [Abstract]
Long term investment	¥ 18,800
Outstanding capital commitments	¥ 26

X

- Definition

Outstanding capital commitments.

+ References

No definition available.

+ Details

Name:	uk_OutstandingCapitalCommitments
Namespace Prefix:	uk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration