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SEGMENT REPORTING (Summary of the Company's Segment Net Sales, Gross Profit and Segment Margin) (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
Gross profit/(loss) by Segment | 22,128 us-gaap_GrossProfit | 40,220 us-gaap_GrossProfit | 68,158 us-gaap_GrossProfit
Gross profit/(loss) by Segment (as a percent) | 17.00%utsi_GrossProfitPercentage | 24.00%utsi_GrossProfitPercentage | 37.00%utsi_GrossProfitPercentage
Segment Margin | 7,666 utsi_SegmentMargin | 20,898 utsi_SegmentMargin | 30,765 utsi_SegmentMargin
General and Corporate | (21,739)utsi_GeneralAndCorporateExpense | (34,131)utsi_GeneralAndCorporateExpense | (60,308)utsi_GeneralAndCorporateExpense
Operating loss | (14,073)us-gaap_OperatingIncomeLoss | (13,233)us-gaap_OperatingIncomeLoss | (29,543)us-gaap_OperatingIncomeLoss
Equipment [Member] |  |  |
Segment reporting [Line Items] |  |  |
Net Sales by Segment | 105,988 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember | 141,138 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember | 160,688 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember
Net Sales by Segment (as a percent) | 82.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember | 86.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember | 86.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember
Gross profit/(loss) by Segment | 21,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember | 41,250 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember | 64,835 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember
Gross profit/(loss) by Segment (as a percent) | 20.00%utsi_GrossProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember | 29.00%utsi_GrossProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember | 40.00%utsi_GrossProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember
Segment Margin | 6,583 utsi_SegmentMargin / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember | 24,047 utsi_SegmentMargin / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember | 34,661 utsi_SegmentMargin / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentSegmentMember
Equipment Based Services [Member] |  |  |
Segment reporting [Line Items] |  |  |
Net Sales by Segment | 23,432 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember | 23,301 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember | 25,784 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember
Net Sales by Segment (as a percent) | 18.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember | 14.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember | 14.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember
Gross profit/(loss) by Segment | 1,128 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember | (1,030)us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember | 3,546 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember
Gross profit/(loss) by Segment (as a percent) | 5.00%utsi_GrossProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember | (4.00%)utsi_GrossProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember | 14.00%utsi_GrossProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember
Segment Margin | 1,105 utsi_SegmentMargin / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember | (1,037)utsi_SegmentMargin / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember | 3,524 utsi_SegmentMargin / us-gaap_StatementBusinessSegmentsAxis = utsi_EquipmentBasedServicesMember
Operational Support Services [Member] |  |  |
Segment reporting [Line Items] |  |  |
Net Sales by Segment |  |  | 256 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = utsi_OperationalSupportServicesMember
Net Sales by Segment (as a percent) | 0.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_OperationalSupportServicesMember | 0.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_OperationalSupportServicesMember | 0.00%utsi_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_OperationalSupportServicesMember
Gross profit/(loss) by Segment |  |  | (223)us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = utsi_OperationalSupportServicesMember
Gross profit/(loss) by Segment (as a percent) | 0.00%utsi_GrossProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_OperationalSupportServicesMember | 0.00%utsi_GrossProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_OperationalSupportServicesMember | (87.00%)utsi_GrossProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = utsi_OperationalSupportServicesMember
Segment Margin | $ (22)utsi_SegmentMargin / us-gaap_StatementBusinessSegmentsAxis = utsi_OperationalSupportServicesMember | $ (2,112)utsi_SegmentMargin / us-gaap_StatementBusinessSegmentsAxis = utsi_OperationalSupportServicesMember | $ (7,420)utsi_SegmentMargin / us-gaap_StatementBusinessSegmentsAxis = utsi_OperationalSupportServicesMember

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + 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 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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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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