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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) (Governmental Investigations [Member], USD $) In Millions, unless otherwise specified | 0 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2009 | Dec. 31, 2005 item
Commitments and contingencies [Line Items] |  |
Number of aspects of the DOJ investigation requiring the production of documents |  | 1 utsi_LossContingenciesNumberOfAspectsOfDOJInvestigationForWhichProductionOfDocumentsRequired
Consent executed to judgment in favor of SEC as a part of the resolution of investigations | $ 1.5 utsi_LossContingenciesConsentExecutedToJudgmentInFavorOfSECAsPartOfResolutionOfInvestigations |
Additional amount paid under the non-prosecution agreement entered into with the DOJ | $ 1.5 utsi_LossContingenciesAdditionalAmountPaidUnderNonProsecutionAgreement |
Period for which the company agreed to undertake reporting obligation under the non-prosecution agreement entered into with the DOJ | 3 years |
Maximum [Member] |  |
Commitments and contingencies [Line Items] |  |
Maximum reporting obligation period | 4 years |

X
- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the additional amount paid by the entity under the non-prosecution agreement entered into with the DOJ. + References No definition available. + Details
Name: | utsi_LossContingenciesAdditionalAmountPaidUnderNonProsecutionAgreement
Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the consent executed to judgment in favor of SEC as a part of the resolution of investigations. + References No definition available. + Details
Name: | utsi_LossContingenciesConsentExecutedToJudgmentInFavorOfSECAsPartOfResolutionOfInvestigations
Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the number of aspects of the DOJ investigation requiring the production of documents from the entity. + References No definition available. + Details
Name: | utsi_LossContingenciesNumberOfAspectsOfDOJInvestigationForWhichProductionOfDocumentsRequired
Namespace Prefix: | utsi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period of reporting obligations to which the entity agreed to, as a part of the resolution of investigations. + References No definition available. + Details
Name: | utsi_LossContingenciesPeriodOfReportingObligationsToWhichEntityAgreedAsPartOfResolutionOfInvestigations
Namespace Prefix: | utsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period for which the entity agreed to undertake reporting obligation under the non-prosecution agreement entered into with the DOJ. + References No definition available. + Details
Name: | utsi_LossContingenciesReportingObligationsPeriodUnderNonProsecutionAgreement
Namespace Prefix: | utsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration