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INCOME TAXES (Tax Credit - Narrative) (Details) (U.S. [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Tax credit carryforwards [Line Items]
Valuation allowance against the related deferred tax assets	$ 87.7us-gaap_TaxCreditCarryforwardValuationAllowance
Foreign [Member] | Tax credit subject To expiration [Member]
Tax credit carryforwards [Line Items]
Tax credit carryforwards	74.5us-gaap_TaxCreditCarryforwardAmount / utsi_AllCountriesAxis = country_US / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / utsi_TaxCreditExpirationTypeAxis = utsi_TaxCreditSubjectToExpirationMember
Alternative minimum tax credit [Member] | Tax credit not subject to expiration [Member]
Tax credit carryforwards [Line Items]
Tax credit carryforwards	1.0us-gaap_TaxCreditCarryforwardAmount / utsi_AllCountriesAxis = country_US / us-gaap_TaxCreditCarryforwardAxis = utsi_AlternativeMinimumTaxCreditMember / utsi_TaxCreditExpirationTypeAxis = utsi_TaxCreditNotSubjectToExpirationMember
R&D credit [Member]
Tax credit carryforwards [Line Items]
Tax credit carryforwards	12.1us-gaap_TaxCreditCarryforwardAmount / utsi_AllCountriesAxis = country_US / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember
R&D credit [Member] | Tax credit subject To expiration [Member]
Tax credit carryforwards [Line Items]
Tax credit carryforwards	8.3us-gaap_TaxCreditCarryforwardAmount / utsi_AllCountriesAxis = country_US / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember / utsi_TaxCreditExpirationTypeAxis = utsi_TaxCreditSubjectToExpirationMember
R&D credit [Member] | Tax credit not subject to expiration [Member]
Tax credit carryforwards [Line Items]
Tax credit carryforwards	$ 3.8us-gaap_TaxCreditCarryforwardAmount / utsi_AllCountriesAxis = country_US / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember / utsi_TaxCreditExpirationTypeAxis = utsi_TaxCreditNotSubjectToExpirationMember

X

- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Carryforwards

-URI http://asc.fasb.org/extlink&oid=6506874

+ Details

Name:	us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Definition

Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Valuation Allowance

-URI http://asc.fasb.org/extlink&oid=6528051

+ Details

Name:	us-gaap_TaxCreditCarryforwardValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_TaxCreditCarryforwardAxis=us-gaap_ResearchMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxCreditCarryforwardAxis=utsi_AlternativeMinimumTaxCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: