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INCOME TAXES (Summary of Components of Net Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred Tax Assets |  |
Allowances and reserves | $ 4,920 utsi_DeferredTaxAssetsTaxDeferredExpenseAllowancesAndReserves | $ 11,125 utsi_DeferredTaxAssetsTaxDeferredExpenseAllowancesAndReserves
Deferred revenue and customer advances, net |  |
Net operating loss carryforward | 230,597 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 254,153 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax credit carryforwards | 87,703 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 95,692 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Capital loss carryforwards | 3,997 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards | 18,671 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Writedown/amortization of intangible assets and goodwill | 12,997 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets | 15,651 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Fixed assets | 6,008 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 7,263 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Demo equipment income | 7,070 utsi_DeferredTaxAssetsDemoEquipmentIncome | 7,104 utsi_DeferredTaxAssetsDemoEquipmentIncome
Accrued warranties |  |
Other | 22,683 us-gaap_DeferredTaxAssetsOther | 18,459 us-gaap_DeferredTaxAssetsOther
Total Deferred Tax Assets | 375,975 us-gaap_DeferredTaxAssetsGross | 428,118 us-gaap_DeferredTaxAssetsGross
Deferred Tax Liabilities |  |
Prepaid expense | (576)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses | (472)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Deferred revenue and customer advances, net | (2,494)utsi_DeferredTaxLiabilitiesDeferredRevenueAndCustomerAdvancesNet | (1,183)utsi_DeferredTaxLiabilitiesDeferredRevenueAndCustomerAdvancesNet
Accrued warranties | (281)utsi_DeferredTaxLiabilitiesAccruedWarranties | (165)utsi_DeferredTaxLiabilitiesAccruedWarranties
Total Deferred Tax Liabilities | (3,351)us-gaap_DeferredIncomeTaxLiabilities | (1,820)us-gaap_DeferredIncomeTaxLiabilities
Total Deferred Tax Assets (Liabilities) | 372,624 utsi_DeferredTaxAssetsLiabilitiesNetBeforeValuationAllowance | 426,298 utsi_DeferredTaxAssetsLiabilitiesNetBeforeValuationAllowance
Less: Valuation Allowance | (368,672)us-gaap_DeferredTaxAssetsValuationAllowance | (422,789)us-gaap_DeferredTaxAssetsValuationAllowance
Total Deferred Tax Assets (Liabilities) | $ 3,952 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 3,509 us-gaap_DeferredTaxAssetsLiabilitiesNet

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