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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 | $ 2.83 us-gaap_SharePrice |  |  |  |  |  |
Impairment charge | $ 3,947,000 us-gaap_ImpairmentOfInvestments | $ 9,400,000 us-gaap_ImpairmentOfInvestments | $ 3,043,000 us-gaap_ImpairmentOfInvestments |  |  |  |
Loss recorded on divestiture |  | 1,307,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 16,239,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal |  |  |  |
Fair value of securities | 50,499,000 us-gaap_AvailableForSaleSecurities | 53,971,000 us-gaap_AvailableForSaleSecurities |  |  |  |  |
Par value of shares (in Hong Kong dollars per share) | $ 0.00375 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.00375 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |
Convertible Bond [Member] |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |
Fair value of securities | 40,200,000 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember | 45,971,000 us-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 |  |  |  |  |  |  | 30,000,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember
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 |  |  |
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 |  |  |  |  | 8,000,000 us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity / invest_InvestmentIssuerAxis = utsi_AioTVIncMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Per share price of investment |  |  |  |  | $ 0.320937 us-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 | 20,200,000 us-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 |  |  |  |  |  |  | 20,000,000 us-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 |  |  |  |  |  | 20,000,000 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 |
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 |  |  |  |  |  | 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 |
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 | $ 5,000,000 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 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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- 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 investment in debt and equity 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 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 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 + 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 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 amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + 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 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + 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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