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Taxation (Details) - Schedule of per share effect of the tax holiday - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Per Share Effect of the Tax Holiday [Abstract]
Effect of tax holiday	$ 469	$ 1,786	$ 824
Per share effect – basic and diluted	$ 0	$ (0.01)	$ 0

X

- Definition

Income loss net of tax per basic per share.

+ References

No definition available.

+ Details

Name:	ucl_IncomeLossNetOfTaxPerBasicPerShare
Namespace Prefix:	ucl_
Data Type:	dtr:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Income tax reconciliation tax holidays reversal.

+ References

No definition available.

+ Details

Name:	ucl_IncomeTaxReconciliationTaxHolidaysReversal
Namespace Prefix:	ucl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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