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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Changes in AOCI, including the Amounts Reclassified to Income) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 item | Dec. 31, 2013 item | Dec. 31, 2012 | Nov. 14, 2014 | Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | $ 65,862,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | $ 79,621,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  |  |
Loss recorded in other comprehensive loss | (2,902,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | (6,671,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | (3,272,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax |  |
Unrealized gain from available-for-sale investments | 673,000 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  |
Less: Gain (loss) reclassified from AOCI to income | 121,000 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax | (7,088,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax |  |  |
Ending balance | 63,754,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 65,862,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 79,621,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  |
Number of chinese entities | 3 utsi_NumberOfInactiveChineseEntities | 2 utsi_NumberOfInactiveChineseEntities |  |  |
Fair value of investment | 50,499,000 us-gaap_AvailableForSaleSecurities | 53,971,000 us-gaap_AvailableForSaleSecurities |  |  |
Investment | 59,799,000 us-gaap_LongTermInvestments | 74,588,000 us-gaap_LongTermInvestments |  |  |
Convertible Bond [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Fair value of investment | 40,200,000 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember | 45,971,000 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |  |
UTStarcom Hong Kong Holdings Ltd. [Member] | Convertible Bond [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Fair value of investment | 20,200,000 us-gaap_AvailableForSaleSecurities / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |  |  |
Cost method investment [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Investment | 2,371,000 us-gaap_LongTermInvestments / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember | 6,081,000 us-gaap_LongTermInvestments / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  |  |
Cost method investment [Member] | Cortina [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Realized loss on disposal |  |  |  |  | 1,500,000 us-gaap_CostMethodInvestmentsRealizedGainLoss / invest_InvestmentIssuerAxis = utsi_CortinaMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember
Investment, ownership interest (as a percent) |  |  |  | 1.00%utsi_InvestmentOwnershipPercentage / invest_InvestmentIssuerAxis = utsi_CortinaMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |
Investment |  | 3,348,000 us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_CortinaMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember |  |  |
Available-for-sale securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Investment | 48,200,000 us-gaap_LongTermInvestments / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember | 53,971,000 us-gaap_LongTermInvestments / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember |  |  |
Available-for-sale securities [Member] | Inphi Corporation [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Unrealized gain from available-for-sale investments | 500,000 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / invest_InvestmentIssuerAxis = utsi_InphiCorporationMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember |  |  |  |
Number of 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 |  |  |  |
Available-for-sale securities [Member] | UTStarcom Hong Kong Holdings Ltd. [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Investment | 20,200,000 us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember | 20,000,000 us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember |  |  |
Available-for-sale securities [Member] | UTStarcom Hong Kong Holdings Ltd. [Member] | Convertible Bond [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Unrealized gain from available-for-sale investments | 200,000 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |  |  |
Fair value of investment | 20,200,000 us-gaap_AvailableForSaleSecurities / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |  |  |
Investment |  | $ 20,000,000 us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |  |

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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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