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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranty (Details)	12 Months Ended
	Dec. 31, 2017
Minimum
Product Warranty
Warranty period	1 year
Period after sale to provide limited warranty services	2 years
Maximum
Product Warranty
Warranty period	2 years

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

X

- Definition

Represent the period after the sale that the entity provides limited warranty services.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the period of standard product warranty.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: