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BALANCE SHEET DETAILS (Schedule of Property, Plant and Equipment, Net) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, plant and equipment, net: [Line Items] |  |  |
Total | $ 59,872,000 us-gaap_PropertyPlantAndEquipmentGross | $ 68,507,000 us-gaap_PropertyPlantAndEquipmentGross |
Less: accumulated depreciation | (56,835,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (63,736,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |
Total Property, plant and equipment, net | 3,037,000 us-gaap_PropertyPlantAndEquipmentNet | 4,771,000 us-gaap_PropertyPlantAndEquipmentNet |
Write off of fully depreciated property, plant and equipment | 7,300,000 us-gaap_TangibleAssetImpairmentCharges | 41,700,000 us-gaap_TangibleAssetImpairmentCharges | 45,300,000 us-gaap_TangibleAssetImpairmentCharges
Accumulated depreciation related to write off of fully depreciated property, plant and equipment | 7,300,000 utsi_AccumulatedDepreciationWritedownOfPropertyPlantAndEquipment | 41,700,000 utsi_AccumulatedDepreciationWritedownOfPropertyPlantAndEquipment | 45,300,000 utsi_AccumulatedDepreciationWritedownOfPropertyPlantAndEquipment
Hangzhou facility [Member] |  |  |
Property, plant and equipment, net: [Line Items] |  |  |
Accelerated depreciation |  | 1,700,000 utsi_AcceleratedDepreciation / us-gaap_SaleLeasebackTransactionDescriptionAxis = utsi_HangzhouFacilityMember |
IPTV divestiture [Member] |  |  |
Property, plant and equipment, net: [Line Items] |  |  |
Derecognized amount of property, plant and equipment |  |  | 9,100,000 us-gaap_PropertyPlantAndEquipmentTransfersAndChanges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember
Accumulated depreciation related to derecognized amount of property, plant and equipment |  |  | 8,200,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationReclassificationsOfPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember
UiTV deconsolidation [Member] |  |  |
Property, plant and equipment, net: [Line Items] |  |  |
Derecognized amount of property, plant and equipment |  |  | 2,000,000 us-gaap_PropertyPlantAndEquipmentTransfersAndChanges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_UiTVMediaIncMember
Accumulated depreciation related to derecognized amount of property, plant and equipment |  |  | 600,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationReclassificationsOfPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_UiTVMediaIncMember
Leasehold improvements [Member] |  |  |
Property, plant and equipment, net: [Line Items] |  |  |
Total | 5,290,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember | 6,009,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember |
Leasehold improvements [Member] | Hangzhou facility [Member] |  |  |
Property, plant and equipment, net: [Line Items] |  |  |
Accelerated depreciation | 200,000 utsi_AcceleratedDepreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember / us-gaap_SaleLeasebackTransactionDescriptionAxis = utsi_HangzhouFacilityMember | 300,000 utsi_AcceleratedDepreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember / us-gaap_SaleLeasebackTransactionDescriptionAxis = utsi_HangzhouFacilityMember |
Accelerated amortization due to early termination |  |  | 900,000 utsi_AcceleratedAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember / us-gaap_SaleLeasebackTransactionDescriptionAxis = utsi_HangzhouFacilityMember
Automobiles [Member] |  |  |
Property, plant and equipment, net: [Line Items] |  |  |
Total | 2,077,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AutomobilesMember | 2,129,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AutomobilesMember |
Software [Member] |  |  |
Property, plant and equipment, net: [Line Items] |  |  |
Total | 6,505,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember | 7,191,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember |
Computer, Equipment and Furniture [Member] |  |  |
Property, plant and equipment, net: [Line Items] |  |  |
Total | 45,981,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = utsi_ComputerEquipmentAndFurnitureMember | 53,085,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = utsi_ComputerEquipmentAndFurnitureMember |
Others [Member] |  |  |
Property, plant and equipment, net: [Line Items] |  |  |
Total | $ 19,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember | $ 93,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember |

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