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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 | $ 2,455,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |  |
2016 | 1,304,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |  |
2017 |  |  |  |
2018 |  |  |  |
2019 |  |  |  |
Thereafter |  |  |  |
Future minimum lease payments | 3,759,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue |  |  |
Rent expense |  |  |  |
Rent expense | 1,800,000 us-gaap_OperatingLeasesRentExpenseNet | 2,400,000 us-gaap_OperatingLeasesRentExpenseNet | 6,300,000 us-gaap_OperatingLeasesRentExpenseNet |
Revenue recognized related to security agreements | 0 us-gaap_ContractsRevenue | 0 us-gaap_ContractsRevenue | 0 us-gaap_ContractsRevenue |
Deferred revenue related to contracts covered by security agreements | 11,700,000 us-gaap_DeferredRevenue | 10,200,000 us-gaap_DeferredRevenue | 9,800,000 us-gaap_DeferredRevenue |
Deferred costs related to contracts covered by security agreements | 5,700,000 us-gaap_DeferredCostsCurrentAndNoncurrent | 5,300,000 us-gaap_DeferredCostsCurrentAndNoncurrent | 6,100,000 us-gaap_DeferredCostsCurrentAndNoncurrent |
Letter of credit: |  |  |  |
Outstanding letters of credit | 17,100,000 us-gaap_LettersOfCreditOutstandingAmount |  |  |
Outstanding purchase commitments, including agreements that are non-cancelable and cancelable without penalty | 29,200,000 us-gaap_LongTermPurchaseCommitmentAmount |  |  |
Intellectual Property |  |  |  |
Claims made for valid enforceable IP | 0 utsi_ClaimsMadeForValidEnforceableIntellectualProperty |  |  |
Uncertain Tax Positions |  |  |  |
Gross unrecognized tax benefits | 45,382,000 us-gaap_UnrecognizedTaxBenefits | 45,430,000 us-gaap_UnrecognizedTaxBenefits | 54,012,000 us-gaap_UnrecognizedTaxBenefits | 55,650,000 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact the annual effective tax rate if recognized | 10,185,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 10,019,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 12,298,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |
Unrecognized tax benefits related to deferred tax assets and federal tax benefit of state income tax items | $ 35,200,000 utsi_UnrecognizedTaxBenefitsRelatedToDeferredTaxAssetsAndFederalTaxBenefitOfStateIncomeTaxItems |  |  |

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- Definition Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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