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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS (Long-term Investments - Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 3 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Nov. 14, 2014 | Sep. 30, 2014 | Mar. 31, 2007 | Dec. 31, 2008 | Oct. 31, 2004 | Dec. 31, 2012 | Mar. 31, 2006 | Aug. 31, 2005 | May 31, 2005 | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2009 | Dec. 31, 2014 | Mar. 31, 2011 | Mar. 31, 2010 | Sep. 30, 2004 | Feb. 28, 2015 | Jun. 30, 2011
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share price of investment | $ 2.83 us-gaap_SharePrice |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.83 us-gaap_SharePrice |  |  |  |  |
Fair value of investment | $ 50,499,000 us-gaap_AvailableForSaleSecurities | 53,971,000 us-gaap_AvailableForSaleSecurities |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,499,000 us-gaap_AvailableForSaleSecurities |  |  |  |  |
Unrealized gain from available-for-sale investments | 673,000 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Xalted Networks [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, ownership interest (as a percent) | 10.00%utsi_InvestmentOwnershipPercentage / dei_LegalEntityAxis = utsi_XaltedNetworksMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 10.00%utsi_InvestmentOwnershipPercentage / dei_LegalEntityAxis = utsi_XaltedNetworksMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cortina [Member] | Cost method investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, ownership interest (as a percent) |  |  | 1.00%utsi_InvestmentOwnershipPercentage / invest_InvestmentIssuerAxis = utsi_CortinaMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized loss on disposal |  |  |  | 1,500,000 us-gaap_CostMethodInvestmentsRealizedGainLoss / invest_InvestmentIssuerAxis = utsi_CortinaMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cortina [Member] | Cost method investment [Member] | Series D preferred convertible stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received in exchange for investment |  |  |  |  | 3,600,000 utsi_StockReceivedDuringPeriodSharesForNoncashConsideration / invest_InvestmentIssuerAxis = utsi_CortinaMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 400,000 utsi_StockReceivedDuringPeriodSharesForNoncashConsideration / invest_InvestmentIssuerAxis = utsi_CortinaMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share price of investment |  |  |  |  | $ 0.837 us-gaap_SharePrice / invest_InvestmentIssuerAxis = utsi_CortinaMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | $ 0.837 us-gaap_SharePrice / invest_InvestmentIssuerAxis = utsi_CortinaMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, ownership interest (as a percent) |  | 1.00%utsi_InvestmentOwnershipPercentage / invest_InvestmentIssuerAxis = utsi_CortinaMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GCT SemiConductor, Inc. [Member] | Cost method investment [Member] | Series D preferred convertible stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire investments |  |  |  |  |  |  | 3,000,000 us-gaap_PaymentsToAcquireLongtermInvestments / invest_InvestmentIssuerAxis = utsi_GctSemiconductorIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Other-than-temporary impairment charge |  |  |  |  |  |  |  | 2,200,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / invest_InvestmentIssuerAxis = utsi_GctSemiconductorIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |
Xalted Networks [Member] | Cost method investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire investments |  |  |  |  |  |  |  |  | 300,000 us-gaap_PaymentsToAcquireLongtermInvestments / invest_InvestmentIssuerAxis = utsi_XaltedNetworksMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember | 1,000,000 us-gaap_PaymentsToAcquireLongtermInvestments / invest_InvestmentIssuerAxis = utsi_XaltedNetworksMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember | 2,000,000 us-gaap_PaymentsToAcquireLongtermInvestments / invest_InvestmentIssuerAxis = utsi_XaltedNetworksMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  |  |  |  |  |  |  |  |
Other-than-temporary impairment charge | 300,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / invest_InvestmentIssuerAxis = utsi_XaltedNetworksMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  |  |  |  |  |  |  |  |  |  | 800,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / invest_InvestmentIssuerAxis = utsi_XaltedNetworksMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember | 500,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / invest_InvestmentIssuerAxis = utsi_XaltedNetworksMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember | 1,700,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / invest_InvestmentIssuerAxis = utsi_XaltedNetworksMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  |  |  |  |  |
SBI [Member] | Cost method investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire investments |  |  |  |  |  | 500,000 us-gaap_PaymentsToAcquireLongtermInvestments / invest_InvestmentIssuerAxis = utsi_SbiMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  | 600,000 us-gaap_PaymentsToAcquireLongtermInvestments / invest_InvestmentIssuerAxis = utsi_SbiMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  |  |  |  |  |  |  | 700,000 us-gaap_PaymentsToAcquireLongtermInvestments / invest_InvestmentIssuerAxis = utsi_SbiMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember | 700,000 us-gaap_PaymentsToAcquireLongtermInvestments / invest_InvestmentIssuerAxis = utsi_SbiMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  |  |
Investment, ownership interest (as a percent) | 2.00%utsi_InvestmentOwnershipPercentage / invest_InvestmentIssuerAxis = utsi_SbiMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember | 2.00%utsi_InvestmentOwnershipPercentage / invest_InvestmentIssuerAxis = utsi_SbiMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  |  |  | 2.00%utsi_InvestmentOwnershipPercentage / invest_InvestmentIssuerAxis = utsi_SbiMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received from investment which was recorded as a reduction to offset the investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 utsi_ProceedsFromLongtermInvestmentsRecordedAsReductionToOffsetInvestment / invest_InvestmentIssuerAxis = utsi_SbiMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  |  |  |  |
ImmenStar, Inc. [Member] | Cost method investment [Member] | Series A preferred stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 us-gaap_PaymentsToAcquireLongtermInvestments / invest_InvestmentIssuerAxis = utsi_ImmenStarIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Cash received in exchange for investment |  |  |  |  | 1,800,000 us-gaap_ProceedsFromSaleOfLongtermInvestments / invest_InvestmentIssuerAxis = utsi_ImmenStarIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 200,000 us-gaap_ProceedsFromSaleOfLongtermInvestments / invest_InvestmentIssuerAxis = utsi_ImmenStarIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kranem Corporation [Member] | Xalted Networks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued and outstanding stock ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00%utsi_StockHoldingPercentage / invest_InvestmentIssuerAxis = utsi_KranemMember / dei_LegalEntityAxis = utsi_XaltedNetworksMember
Kranem Corporation [Member] | Cost method investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other-than-temporary impairment charge | 20,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / invest_InvestmentIssuerAxis = utsi_KranemMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inphi Corporation [Member] | Available for sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received in exchange for investment |  |  | 124,395 utsi_StockReceivedDuringPeriodSharesForNoncashConsideration / invest_InvestmentIssuerAxis = utsi_InphiCorporationMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment | 2,300,000 us-gaap_AvailableForSaleSecurities / invest_InvestmentIssuerAxis = utsi_InphiCorporationMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 us-gaap_AvailableForSaleSecurities / invest_InvestmentIssuerAxis = utsi_InphiCorporationMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember |  |  |  |  |
Unrealized gain from available-for-sale investments | 500,000 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / invest_InvestmentIssuerAxis = utsi_InphiCorporationMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inphi Corporation [Member] | Available for sale [Member] | Subsequent event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received in exchange for investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,400,000 us-gaap_ProceedsFromSaleOfLongtermInvestments / invest_InvestmentIssuerAxis = utsi_InphiCorporationMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Shares of investment classified as available-for-sale securities sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 124,395 utsi_AvailableForSaleSecuritiesSharesSold / invest_InvestmentIssuerAxis = utsi_InphiCorporationMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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