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

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