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COMMITMENTS AND CONTINGENCIES (Schedule of Future Minimum Lease Payments Under All Non-cancelable Operating Leases With Initial Term In Excess of One Year) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Leases        
2015 $ 2,455,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent      
2016 1,304,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears      
2017         
2018         
2019         
Thereafter         
Future minimum lease payments 3,759,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue      
Rent expense        
Rent expense 1,800,000us-gaap_OperatingLeasesRentExpenseNet 2,400,000us-gaap_OperatingLeasesRentExpenseNet 6,300,000us-gaap_OperatingLeasesRentExpenseNet  
Revenue recognized related to security agreements 0us-gaap_ContractsRevenue 0us-gaap_ContractsRevenue 0us-gaap_ContractsRevenue  
Deferred revenue related to contracts covered by security agreements 11,700,000us-gaap_DeferredRevenue 10,200,000us-gaap_DeferredRevenue 9,800,000us-gaap_DeferredRevenue  
Deferred costs related to contracts covered by security agreements 5,700,000us-gaap_DeferredCostsCurrentAndNoncurrent 5,300,000us-gaap_DeferredCostsCurrentAndNoncurrent 6,100,000us-gaap_DeferredCostsCurrentAndNoncurrent  
Letter of credit:        
Outstanding letters of credit 17,100,000us-gaap_LettersOfCreditOutstandingAmount      
Outstanding purchase commitments, including agreements that are non-cancelable and cancelable without penalty 29,200,000us-gaap_LongTermPurchaseCommitmentAmount      
Intellectual Property        
Claims made for valid enforceable IP 0utsi_ClaimsMadeForValidEnforceableIntellectualProperty      
Uncertain Tax Positions        
Gross unrecognized tax benefits 45,382,000us-gaap_UnrecognizedTaxBenefits 45,430,000us-gaap_UnrecognizedTaxBenefits 54,012,000us-gaap_UnrecognizedTaxBenefits 55,650,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact the annual effective tax rate if recognized 10,185,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 10,019,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 12,298,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Unrecognized tax benefits related to deferred tax assets and federal tax benefit of state income tax items $ 35,200,000utsi_UnrecognizedTaxBenefitsRelatedToDeferredTaxAssetsAndFederalTaxBenefitOfStateIncomeTaxItems