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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
Deferred Tax Assets    
Allowances and reserves $ 4,920utsi_DeferredTaxAssetsTaxDeferredExpenseAllowancesAndReserves $ 11,125utsi_DeferredTaxAssetsTaxDeferredExpenseAllowancesAndReserves
Deferred revenue and customer advances, net      
Net operating loss carryforward 230,597us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 254,153us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax credit carryforwards 87,703us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 95,692us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Capital loss carryforwards 3,997us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 18,671us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Writedown/amortization of intangible assets and goodwill 12,997us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 15,651us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Fixed assets 6,008us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 7,263us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Demo equipment income 7,070utsi_DeferredTaxAssetsDemoEquipmentIncome 7,104utsi_DeferredTaxAssetsDemoEquipmentIncome
Accrued warranties      
Other 22,683us-gaap_DeferredTaxAssetsOther 18,459us-gaap_DeferredTaxAssetsOther
Total Deferred Tax Assets 375,975us-gaap_DeferredTaxAssetsGross 428,118us-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) 372,624utsi_DeferredTaxAssetsLiabilitiesNetBeforeValuationAllowance 426,298utsi_DeferredTaxAssetsLiabilitiesNetBeforeValuationAllowance
Less: Valuation Allowance (368,672)us-gaap_DeferredTaxAssetsValuationAllowance (422,789)us-gaap_DeferredTaxAssetsValuationAllowance
Total Deferred Tax Assets (Liabilities) $ 3,952us-gaap_DeferredTaxAssetsLiabilitiesNet $ 3,509us-gaap_DeferredTaxAssetsLiabilitiesNet