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Taxation (Details) - Schedule of movement of valuation allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Movement of Valuation Allowance [Abstract]
Balance at beginning of the year	$ 15,235	$ 9,830	$ 7,095
Change of valuation allowance	1,569	5,405	2,735
Balance at end of the year	$ 16,804	$ 15,235	$ 9,830

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- References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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No definition available.

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Namespace Prefix:	ucl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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.

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No definition available.

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