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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Summary of Available-for-sale Investments -Additional Information (Details)	12 Months Ended
	Dec. 31, 2021
Minimum
Schedule of Available-for-sale Securities [Line Items]
Maturity period of bank notes receivable	3 months
Maximum
Schedule of Available-for-sale Securities [Line Items]
Maturity period of bank notes receivable	1 year

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

X

- Definition

Maturity period of bank notes receivable.

+ References

No definition available.

+ Details

Name:	utsi_NotesAndLoansReceivableMaturityPeriod
Namespace Prefix:	utsi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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