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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS (Available-for-sale Securities - Narrative) (Details) (USD $)	12 Months Ended			162 Months Ended	0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2013	Nov. 30, 2012	Apr. 07, 2015	Aug. 31, 2012
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Per share price of investment	$ 2.83us-gaap_SharePrice
Impairment charge	$ 3,947,000us-gaap_ImpairmentOfInvestments	$ 9,400,000us-gaap_ImpairmentOfInvestments	$ 3,043,000us-gaap_ImpairmentOfInvestments
Loss recorded on divestiture		1,307,000us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	16,239,000us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Fair value of securities	50,499,000us-gaap_AvailableForSaleSecurities	53,971,000us-gaap_AvailableForSaleSecurities
Par value of shares (in Hong Kong dollars per share)	$ 0.00375us-gaap_CommonStockParOrStatedValuePerShare	$ 0.00375us-gaap_CommonStockParOrStatedValuePerShare
Convertible Bond [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Fair value of securities	40,200,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember	45,971,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
IPTV operations [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Amount of consideration paid by the Company upon divestiture							30,000,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember
Loss recorded on divestiture			17,500,000us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember	(100,000)us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember
AioTV [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Equity method investment, ownership interest (as a percent)	44.00%utsi_InvestmentOwnershipPercentage / invest_InvestmentIssuerAxis = utsi_AioTVIncMember
AioTV [Member] | Series B preferred stock [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Payments to acquire available-for-sale equity securities					8,000,000us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity / invest_InvestmentIssuerAxis = utsi_AioTVIncMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Per share price of investment					$ 0.320937us-gaap_SharePrice / invest_InvestmentIssuerAxis = utsi_AioTVIncMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
UTStarcom Hong Kong Holdings Ltd. [Member] | Convertible Bond [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Fair value of securities	20,200,000us-gaap_AvailableForSaleSecurities / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
UTStarcom Hong Kong Holdings Ltd. [Member] | IPTV operations [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Loss recorded on divestiture			(17,500,000)us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember
UTStarcom Hong Kong Holdings Ltd. [Member] | IPTV operations [Member] | Subsequent Events [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Ownership interest upon conversion of preference shares and convertible bonds						14.00%utsi_CostMethodInvestmentOwnershipPercentageUponConversionOfSecurities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
UTStarcom Hong Kong Holdings Ltd. [Member] | IPTV operations [Member] | Convertible Bond [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Principal amount of consideration received							20,000,000us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
UTStarcom Hong Kong Holdings Ltd. [Member] | IPTV operations [Member] | Convertible Bond [Member] | Subsequent Events [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Face amount of convertible debt						20,000,000us-gaap_DebtConversionOriginalDebtAmount1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Cash proceeds from partial payment of the principal of the Convertible Bond						10,000,000us-gaap_ProceedsFromConvertibleDebt / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Ownership interest upon conversion of preference shares and convertible bonds						14.00%utsi_CostMethodInvestmentOwnershipPercentageUponConversionOfSecurities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
UTStarcom Hong Kong Holdings Ltd. [Member] | Ordinary Shares [Member] | IPTV operations [Member] | Subsequent Events [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Convertible Bond converted to ordinary shares						14us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
UTStarcom Hong Kong Holdings Ltd. [Member] | UTStarcom Hong Kong Ltd. [Member] | Convertible Bond [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Interest rate of debt securities (as a percent)		6.50%invest_InvestmentInterestRate / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / dei_LegalEntityAxis = utsi_UTStarcomHongKongLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember					6.50%invest_InvestmentInterestRate / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / dei_LegalEntityAxis = utsi_UTStarcomHongKongLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
Principal amount of debt securities to be converted if P&L run-rate break-even is achieved on or prior to the Maturity Date	$ 5,000,000utsi_InvestmentInDebtSecuritiesOriginalPrincipalAmountToBeConvertedOnSatisfactionOfSpecifiedConditionOnOrPriorToMaturityDate / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / dei_LegalEntityAxis = utsi_UTStarcomHongKongLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
Percentage of outstanding shares to be issued on conversion if operating income break-even is achieved on or prior to the Maturity Date	8.00%utsi_InvestmentInDebtSecuritiesPercentageOfSharesToBeIssuedOnConversionOnSatisfactionOfSpecifiedConditionOnOrPriorToMaturityDate / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / dei_LegalEntityAxis = utsi_UTStarcomHongKongLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
Minimum [Member] | UTStarcom Hong Kong Holdings Ltd. [Member] | UTStarcom Hong Kong Ltd. [Member] | Convertible Bond [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Percentage of outstanding shares to be issued on conversion at the Maturity Date	25.00%utsi_InvestmentInDebtSecuritiesPercentageOfSharesToBeIssuedOnConversionAtMaturityDate / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / dei_LegalEntityAxis = utsi_UTStarcomHongKongLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] | UTStarcom Hong Kong Holdings Ltd. [Member] | UTStarcom Hong Kong Ltd. [Member] | Convertible Bond [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Percentage of outstanding shares to be issued on conversion at the Maturity Date	33.00%utsi_InvestmentInDebtSecuritiesPercentageOfSharesToBeIssuedOnConversionAtMaturityDate / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / dei_LegalEntityAxis = utsi_UTStarcomHongKongLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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The interest rate for investments that have an interest rate. For fixed rate investments, this indicates the fixed interest rate. If the investment has a variable interest rate, the rate stated here may be the rate that is currently relevant. In this case the "Investment, Interest Rate is Current Rate for Variable Rate Investment Flag", "Investment, Interest Rate is Discount Rate at Purchase Flag", "Investment, Interest Rate Reflects Current Yield Flag" should be used. If one of these flags are not appropriate to explain the interest rate that is indicated, then a new flag should be added or an explanation should be included in "Investment, Additional Information".

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