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Accounts receivable, net (Details) - Schedule of movement in allowance for doubtful accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of movement in allowance for doubtful accounts [Abstract]
Balance at beginning of the period	$ 3,350	$ 3,289	$ 495
Additions	1,273	67	2,785
Reversal	(26)	(22)
Exchange difference	(78)	16
Balance at end of the period	$ 4,519	$ 3,350	$ 3,289

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- References

No definition available.

+ Details

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- Definition

Allowance for doubtful accounts receivable exchange differences.

+ References

No definition available.

+ Details

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Namespace Prefix:	ucl_
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- Definition

Amount of expense for expected credit loss on accounts receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	ucl_
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- Definition

Amount of expense for expected credit loss on reversal.

+ References

No definition available.

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- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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