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Unaudited Condensed Consolidated Statements of Operations (Parentheticals) - CNY (¥) ¥ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement [Abstract] |  |  |  |  |
Marketing and branding service revenue | ¥ 3,099 | ¥ 60,922 | ¥ 77,046 | ¥ 117,796 |
Other service revenue | 10,847 | 4,508 | 19,955 | 12,116 | 4,435
Workspace membership | 3,671 | 9,908 | 12,564 | 22,336 | 11,964
Marketing and branding service | ¥ 826 | ¥ 7,276 | ¥ 11,504 | ¥ 57,444 |

X
- References No definition available. + Details
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Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered at marketing and branding service revenues. + References No definition available. + Details
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Namespace Prefix: | uk_
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- Definition Amount of other service revenue to related parties. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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