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SEGMENT REPORTING (Schedule of Long-lived Assets, consisting of Property, Plant and Equipment, by Geographical Area) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Segment reporting [Line Items] |  |
Long-lived assets | $ 3,037 us-gaap_PropertyPlantAndEquipmentNet | $ 4,771 us-gaap_PropertyPlantAndEquipmentNet
China [Member] |  |
Segment reporting [Line Items] |  |
Long-lived assets | 1,988 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN | 3,795 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN
Other [Member] |  |
Segment reporting [Line Items] |  |
Long-lived assets | $ 1,049 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = utsi_OtherCountriesMember | $ 976 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = utsi_OtherCountriesMember

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=utsi_OtherCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |