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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Product Warranty - Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Product Warranty:
Warranty accrual reversals	$ 0.1utsi_WarrantyAccrualReversals	$ 0.1utsi_WarrantyAccrualReversals	$ 0.3utsi_WarrantyAccrualReversals
Minimum [Member]
Product Warranty:
Warranty period	1 year
Period after sales to provide limited warranty services	2 years
Maximum [Member]
Product Warranty:
Warranty period	2 years

X

- Details

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

X

- Definition

Represent the period after the sales then 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

- Definition

Represents product warranty accrual reversals during the period.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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