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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
Segment reporting [Line Items]
Long-lived assets	$ 3,037us-gaap_PropertyPlantAndEquipmentNet	$ 4,771us-gaap_PropertyPlantAndEquipmentNet
China [Member]
Segment reporting [Line Items]
Long-lived assets	1,988us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN	3,795us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN
Other [Member]
Segment reporting [Line Items]
Long-lived assets	$ 1,049us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = utsi_OtherCountriesMember	$ 976us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = utsi_OtherCountriesMember

X

- 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

Name:	us-gaap_PropertyPlantAndEquipmentNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_CN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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