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DIVESTITURES (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 162 Months Ended | 0 Months Ended | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Aug. 31, 2012 | Sep. 30, 2010 | Dec. 31, 2011 | Sep. 17, 2012 | Dec. 31, 2010 | Jun. 30, 2010 | Dec. 31, 2013 | Mar. 31, 2013 | Jun. 30, 2012 | Dec. 31, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Dec. 31, 2012 | Jun. 30, 2013 | Apr. 07, 2015 | Mar. 22, 2013 | Sep. 30, 2013
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) recorded on divestiture |  | $ (1,307,000)us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | $ (16,239,000)us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of obligations paid |  | 503,000 utsi_DisposalGroupNotDiscontinuedOperationObligationsPaid | 56,010,000 utsi_DisposalGroupNotDiscontinuedOperationObligationsPaid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of unpaid balance related to divestiture | 804,000 utsi_PaymentsOnDivestitureOfBusinesses | 2,369,000 utsi_PaymentsOnDivestitureOfBusinesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred service costs related to unassigned contracts | 5,700,000 us-gaap_DeferredCostsCurrentAndNoncurrent | 5,300,000 us-gaap_DeferredCostsCurrentAndNoncurrent | 6,100,000 us-gaap_DeferredCostsCurrentAndNoncurrent |  |  |  |  |  |  | 5,300,000 us-gaap_DeferredCostsCurrentAndNoncurrent |  |  |  |  |  |  | 6,100,000 us-gaap_DeferredCostsCurrentAndNoncurrent |  |  |  |
Revenues recognized | 129,420,000 us-gaap_SalesRevenueNet | 164,439,000 us-gaap_SalesRevenueNet | 186,728,000 us-gaap_SalesRevenueNet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value of shares (in Hong Kong dollars per share) | $ 0.00375 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.00375 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |  |  |  | $ 0.00375 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |  |  |  |  |  |  |
UTStarcom Hong Kong Holdings Ltd. [Member] | UTStarcom Hong Kong Ltd. [Member] | Convertible Bond [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [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 | 5,000,000 utsi_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 P&L run-rate 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UTStarcom Hong Kong Holdings Ltd. [Member] | UTStarcom Hong Kong Ltd. [Member] | Convertible Bond [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UTStarcom Hong Kong Holdings Ltd. [Member] | UTStarcom Hong Kong Ltd. [Member] | Convertible Bond [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
China PDSN Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) recorded on divestiture |  |  | 800,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_ChinaPDSNAssetsMember |  | 1,600,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_ChinaPDSNAssetsMember | 4,300,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_ChinaPDSNAssetsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
China PDSN Assets [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reassessment period |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EMEA Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) recorded on divestiture |  |  |  |  |  |  |  | (900,000)us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_EMEAOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of obligations paid |  |  |  |  |  |  | 600,000 utsi_DisposalGroupNotDiscontinuedOperationObligationsPaid / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_EMEAOperationsMember | 700,000 utsi_DisposalGroupNotDiscontinuedOperationObligationsPaid / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_EMEAOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of obligations remaining in accrual balance |  |  |  |  |  |  |  | 1,000,000 utsi_DisposalGroupNotDiscontinuedOperationObligationsPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_EMEAOperationsMember |  |  |  |  |  |  | 1,000,000 utsi_DisposalGroupNotDiscontinuedOperationObligationsPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_EMEAOperationsMember |  |  |  |  |  |
IP Messaging and US PDSN Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net liabilities transferred in connection with divestiture |  |  |  |  |  |  |  |  | 1,700,000 utsi_DisposalGroupNotDiscontinuedOperationConsiderationForNetLiabilitiesTransferred / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds |  |  |  |  |  |  |  |  | 400,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) recorded on divestiture, after tax |  |  |  |  |  |  |  |  | 2,100,000 us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember |  |  |  |  |  |  |  |  |  |  |  |
IP Messaging and US PDSN Assets [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential additional contingent consideration |  |  |  |  |  |  |  |  | 1,600,000 utsi_DisposalGroupNotDiscontinuedOperationPotentialAdditionalContingentConsideration / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |  |  |
IP Messaging and US PDSN Assets [Member] | Contingent consideration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) recorded on divestiture |  |  |  |  |  |  |  |  |  | 900,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_ContingentConsiderationByTypeAxis = utsi_CashConsiderationMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember | 100,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_ContingentConsiderationByTypeAxis = utsi_CashConsiderationMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember |  | 200,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_ContingentConsiderationByTypeAxis = utsi_CashConsiderationMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember | 200,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_ContingentConsiderationByTypeAxis = utsi_CashConsiderationMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember |  | 900,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_ContingentConsiderationByTypeAxis = utsi_CashConsiderationMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember |  |  |  |  |
Cash proceeds |  |  |  |  |  |  |  |  |  |  | 100,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_ContingentConsiderationByTypeAxis = utsi_CashConsiderationMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember | 100,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_ContingentConsiderationByTypeAxis = utsi_CashConsiderationMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember | 200,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_ContingentConsiderationByTypeAxis = utsi_CashConsiderationMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember | 200,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_ContingentConsiderationByTypeAxis = utsi_CashConsiderationMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember | 900,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_ContingentConsiderationByTypeAxis = utsi_CashConsiderationMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember | 900,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_ContingentConsiderationByTypeAxis = utsi_CashConsiderationMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPMessagingAndUSPDSNAssetsMember |  |  |  |  |
IPTV operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) recorded on divestiture |  |  | (17,500,000)us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |
Amount of obligations remaining in accrual balance |  |  | 600,000 utsi_DisposalGroupNotDiscontinuedOperationObligationsPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 utsi_DisposalGroupNotDiscontinuedOperationObligationsPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |
Amount of consideration paid by the Company upon divestiture |  |  |  | 30,000,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities transferred in connection with divestiture |  |  |  | 74,100,000 us-gaap_DisposalGroupLiabilitiesOfBusinessTransferredUnderContractualArrangement / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss related to severance liabilities for termination of employees or transfer of employees to the buyer |  |  | 13,400,000 us-gaap_SeveranceCosts1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss related to write-off of assets not transferred to the buyer |  |  | 3,800,000 us-gaap_OtherAssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs |  |  | 1,700,000 utsi_DisposalGroupNotDiscontinuedOperationTransactionCosts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of unpaid balance related to divestiture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 utsi_PaymentsOnDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |
Gain from the net liability release |  |  | 1,500,000 utsi_DisposalGroupNotDiscontinuedOperationGainOnDisposalRelatedToNetLiabilityRelease / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred service costs related to unassigned contracts |  |  |  | 22,700,000 us-gaap_DeferredCostsCurrentAndNoncurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues recognized | 4,300,000 us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember | 1,400,000 us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember | 29,500,000 us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |
Liabilities and deferred costs related to un-assigned contracts | 21,500,000 utsi_RevenueRecognitionLiabilityAndDeferredCostRelatedToUnassignedContracts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  | 47,300,000 utsi_RevenueRecognitionLiabilityAndDeferredCostRelatedToUnassignedContracts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IPTV operations [Member] | UTStarcom Hong Kong Holdings Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) recorded on divestiture |  |  | 17,500,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IPTV operations [Member] | UTStarcom Hong Kong Holdings Ltd. [Member] | Subsequent Events [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [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 |  |
IPTV operations [Member] | UTStarcom Hong Kong Holdings Ltd. [Member] | Subsequent Events [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Bond converted to ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
IPTV operations [Member] | UTStarcom Hong Kong Holdings Ltd. [Member] | Convertible Bond [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount invested |  |  |  | 20,000,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IPTV operations [Member] | UTStarcom Hong Kong Holdings Ltd. [Member] | Convertible Bond [Member] | Subsequent Events [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 us-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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 us-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 |  |
IPTV operations [Member] | Current assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets transferred in connection with divestiture |  |  |  | 41,400,000 us-gaap_DisposalGroupAssetsOfBusinessTransferredUnderContractualArrangement / us-gaap_BalanceSheetLocationAxis = utsi_CurrentAssetsMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IPTV operations [Member] | Property, plant and equipment and other long term assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets transferred in connection with divestiture |  |  |  | 1,200,000 us-gaap_DisposalGroupAssetsOfBusinessTransferredUnderContractualArrangement / us-gaap_BalanceSheetLocationAxis = utsi_PropertyPlantAndEquipmentAndOtherLongTermAssetsMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NGN operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) recorded on divestiture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,200,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_NextGenerationNetworkEquipmentBusinessMember |
Divestiture loss related to on-going performance cost for the assigned contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 utsi_DisposalGroupNotDiscontinuedOperationGainLossOnDisposalRelatedToOnGoingPerformanceCostForAssignedContract / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_NextGenerationNetworkEquipmentBusinessMember |
Divestiture loss related to severance cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 utsi_DisposalGroupNotDiscontinuedOperationGainLossOnDisposalRelatedToSeveranceCost / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_NextGenerationNetworkEquipmentBusinessMember |
DOCSIS-EOC product line [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_DOCSISEOCProductLineMember |  | $ 1,800,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_DOCSISEOCProductLineMember | $ 1,800,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_DOCSISEOCProductLineMember

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- Definition 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". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition In a transaction not treated as a divestiture for accounting purposes and in which the disposed operation is not consolidated for accounting purposes, the aggregate amount of the disposed assets that are segregated in the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section E -Paragraph Question 2 + Details
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- Definition In a transaction not treated as a divestiture for accounting purposes and in which the disposed operation is not consolidated for accounting purposes, the aggregate amount of the disposed liabilities that are segregated in the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section E -Paragraph Question 2 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 5.E.Q2) -URI http://asc.fasb.org/extlink&oid=27015204&loc=d3e355146-122828 + Details
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- Definition The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 + Details
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- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + 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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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The difference between the value of the consideration received by the Entity on the sale or disposal and the consideration received by the Entity, including any tax related impact. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Number of shares issued during the period as a result of the conversion of convertible securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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