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Restricted Net Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Restricted Net Assets (Details) [Line Items]
Percentage of general reserve fund of registered capital	50.00%
Restricted net assets (in Dollars)	$ 49,376
Restricted net assets exceeded percentage	25.00%
Minimum [Member]
Restricted Net Assets (Details) [Line Items]
Percentage of income after tax to reserve	10.00%

X

- Definition

Percentage of general reserve fund of registered capital.

+ References

No definition available.

+ Details

Name:	ucl_PercentageOfGeneralReserveFundOfRegisteredCapital
Namespace Prefix:	ucl_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of income after tax to reserve.

+ References

No definition available.

+ Details

Name:	ucl_PercentageOfIncomeAfterTaxToReserve
Namespace Prefix:	ucl_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Restricted net assets.

+ References

No definition available.

+ Details

Name:	ucl_RestrictedNetAssets
Namespace Prefix:	ucl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ucl_RestrictedNetAssetsDetailsLineItems
Namespace Prefix:	ucl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Restricted net assets exceeded percentage.

+ References

No definition available.

+ Details

Name:	ucl_RestrictedNetAssetsExceededPercentage
Namespace Prefix:	ucl_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: