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v2.4.1.9

SUBSEQUENT EVENTS (Details) (USD $) | 12 Months Ended | 1 Months Ended | 0 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 28, 2015 | Apr. 07, 2015 | Nov. 12, 2015
Subsequent events [Line Items] |  |  |  |  |  |
Value of shares repurchased | $ 10,308,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 30,680,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 8,842,000 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |
Subsequent Events [Member] | Inphi Corporation [Member] | Available-for-sale securities [Member] |  |  |  |  |  |
Subsequent events [Line Items] |  |  |  |  |  |
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 |  |
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 |  |
Subsequent Events [Member] | IPTV operations [Member] | UTStarcom Hong Kong Holdings Ltd. [Member] |  |  |  |  |  |
Subsequent events [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 |
Subsequent Events [Member] | IPTV operations [Member] | Convertible Bond [Member] | UTStarcom Hong Kong Holdings Ltd. [Member] |  |  |  |  |  |
Subsequent events [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 |
Subsequent Events [Member] | Repurchase program, November 2015 [Member] | Scenario forecast [Member] |  |  |  |  |  |
Subsequent events [Line Items] |  |  |  |  |  |
Shares repurchased under program |  |  |  |  |  | 691,691 us-gaap_TreasuryStockNumberOfSharesHeld / us-gaap_ShareRepurchaseProgramAxis = utsi_RepurchaseProgramNovember2015Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Value of shares repurchased |  |  |  |  |  | $ 1,900,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = utsi_RepurchaseProgramNovember2015Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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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 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 from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, beyond the current operating cycle. + References No definition available. + Details
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- Details
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- Definition Number of shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + 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 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition The number of shares of investment classified as available-for-sale securities sold. + References No definition available. + Details
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- Definition Represents cost method ownership interest upon conversion of preference shares and convertible bonds. + References No definition available. + Details
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