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Income Taxes (Details) - Schedule of increase in income tax expenses and net loss per share amounts - CNY (¥) ¥ / shares in Units, ¥ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of increase in income tax expenses and net loss per share amounts [Abstract] |  |  |
Increase in income tax expenses | ¥ 1,764 | ¥ 5,299 | ¥ 1,208
Net loss per share-basic and diluted | ¥ (7.53) | ¥ (15.91) | ¥ (9.94)

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- Definition Increase in income tax expenses + References No definition available. + Details
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Namespace Prefix: | uk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1337-109256 + Details
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Namespace Prefix: | us-gaap_
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