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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Useful Lives of Property, Plant and Equipment) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 2.9 us-gaap_Depreciation | $ 5.4 us-gaap_Depreciation | $ 4.4 us-gaap_Depreciation
Hangzhou office [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accelerated amortization due to early termination | 0.2 utsi_AcceleratedAmortization / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = utsi_HangzhouOfficeMember |  |
Furniture, test or manufacturing equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful lives | 5 years |  |
Computers and software [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful lives | 2 years |  |
Computers and software [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful lives | 3 years |  |
Automobiles [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful lives | 5 years |  |
Leasehold improvements [Member] | Beijing and Hangzhou offices [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accelerated amortization due to early termination |  | 2.0 utsi_AcceleratedAmortization / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = utsi_BeijingAndHangzhouOfficeMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember |
Leasehold improvements [Member] | Beijing office [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accelerated amortization due to early termination |  |  | $ 0.9 utsi_AcceleratedAmortization / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = utsi_BeijingOfficeMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_Depreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of accelerated amortization included in accumulated depreciation, depletion and amortization (relating to property, plant and equipment) written down during the period. + References No definition available. + Details
Name: | utsi_AcceleratedAmortization
Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=utsi_HangzhouOfficeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_AutomobilesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=utsi_FurnitureTestOrManufacturingEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |