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SEGMENT REPORTING (Schedule of Sales Data by Geographical Area) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment reporting [Line Items]
Net Sales by Segment	$ 129,420us-gaap_SalesRevenueNet	$ 164,439us-gaap_SalesRevenueNet	$ 186,728us-gaap_SalesRevenueNet
Net Sales by Segment (as a percent)	100.00%utsi_SalesRevenueNetPercentage	100.00%utsi_SalesRevenueNetPercentage	100.00%utsi_SalesRevenueNetPercentage
China [Member]
Segment reporting [Line Items]
Net Sales by Segment	15,465us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN	6,945us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN	38,544us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN
Net Sales by Segment (as a percent)	12.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = country_CN	4.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = country_CN	21.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = country_CN
Japan [Member]
Segment reporting [Line Items]
Net Sales by Segment	58,999us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP	93,203us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP	99,367us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP
Net Sales by Segment (as a percent)	46.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = country_JP	57.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = country_JP	53.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = country_JP
India [Member]
Segment reporting [Line Items]
Net Sales by Segment	37,424us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IN	26,595us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IN	23,992us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IN
Net Sales by Segment (as a percent)	29.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = country_IN	16.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = country_IN	13.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = country_IN
Taiwan [Member]
Segment reporting [Line Items]
Net Sales by Segment	6,706us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW	13,332us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW	9,824us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW
Net Sales by Segment (as a percent)	5.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = country_TW	8.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = country_TW	5.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = country_TW
Other [Member]
Segment reporting [Line Items]
Net Sales by Segment	$ 10,826us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = utsi_OtherCountriesMember	$ 24,364us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = utsi_OtherCountriesMember	$ 15,001us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = utsi_OtherCountriesMember
Net Sales by Segment (as a percent)	8.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = utsi_OtherCountriesMember	15.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = utsi_OtherCountriesMember	8.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementGeographicalAxis = utsi_OtherCountriesMember

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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- Details

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X

- Definition

Represents the net sales, expressed as a percentage of net sales revenue.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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