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Taxation (Details) - Schedule of Per Share Effect of the Tax Holidays (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Per Share Effect of the Tax Holidays [Abstract] |  |  |
Per share effect – diluted | $ 0.00 | $ 0.00 | $ (0.01)

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- Definition Income loss net of tax per diluted share. + References No definition available. + Details
Name: | ucl_IncomeLossNetOfTaxPerDilutedShare
Namespace Prefix: | ucl_
Data Type: | dtr:perShareItemType
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_IncomeTaxHolidayLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration