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SEGMENT REPORTING (Schedule of Sales Data by Geographical Area) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment reporting [Line Items] |  |  |
Net Sales by Segment | $ 129,420 us-gaap_SalesRevenueNet | $ 164,439 us-gaap_SalesRevenueNet | $ 186,728 us-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 | 15,465 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN | 6,945 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN | 38,544 us-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 | 58,999 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP | 93,203 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP | 99,367 us-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 | 37,424 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IN | 26,595 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IN | 23,992 us-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 | 6,706 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW | 13,332 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW | 9,824 us-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 | $ 10,826 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = utsi_OtherCountriesMember | $ 24,364 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = utsi_OtherCountriesMember | $ 15,001 us-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

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- 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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- Definition Represents the net sales, expressed as a percentage of net sales revenue. + References No definition available. + Details
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