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OTHER INCOME (EXPENSE), NET - Schedule of Components of Other Income (expense), Net (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2019
Other Income And Expenses [Abstract]
Reversal of ASC 460 reserve due to expiration of statute of limitations	$ 42	$ 1,182

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- References

No definition available.

+ Details

Name:	us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Represents the amount of reversal of tax provision.

+ References

No definition available.

+ Details

Name:	utsi_TaxProvisionReversal
Namespace Prefix:	utsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration