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COMMON STOCK REPURCHASE AND ISSUANCE (Details) (USD $) | 12 Months Ended | 0 Months Ended | 17 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 17, 2014 | Mar. 11, 2014 | Aug. 12, 2011 | Dec. 31, 2012 | Nov. 30, 2012 | Nov. 12, 2014
Repurchase program disclosures [Line Items] |  |  |  |  |  |  |  |  |
Value of shares repurchased | $ 10,308,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 30,680,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 8,842,000 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  |  |
Per share price of investment | $ 2.83 us-gaap_SharePrice |  |  |  |  |  |  |  |
Par value of shares (in dollars per share) | $ 0.00375 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.00375 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |  |  |
Share Purchase Agreement [Member] | Reporting Entities [Member] |  |  |  |  |  |  |  |  |
Repurchase program disclosures [Line Items] |  |  |  |  |  |  |  |  |
Value of shares repurchased |  |  |  | 9,900,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_CounterpartyNameAxis = utsi_ReportingEntitiesMember / us-gaap_TypeOfArrangementAxis = utsi_SharePurchaseAndSalesAgreementMember |  |  |  |  |
Per share price of investment |  |  |  | $ 2.54 us-gaap_SharePrice / us-gaap_CounterpartyNameAxis = utsi_ReportingEntitiesMember / us-gaap_TypeOfArrangementAxis = utsi_SharePurchaseAndSalesAgreementMember |  |  |  |  |
Number of shares of common stock repurchased |  |  |  | 3,883,875 utsi_CommonStockRepurchased / us-gaap_CounterpartyNameAxis = utsi_ReportingEntitiesMember / us-gaap_TypeOfArrangementAxis = utsi_SharePurchaseAndSalesAgreementMember |  |  |  |  |
Share Purchase Agreement [Member] | Shah Capital [Member] |  |  |  |  |  |  |  |  |
Repurchase program disclosures [Line Items] |  |  |  |  |  |  |  |  |
Per share price of investment |  |  |  | $ 2.54 us-gaap_SharePrice / us-gaap_CounterpartyNameAxis = utsi_ShahCapitalOpportunityFundLPAndHimanshuHShahMember / us-gaap_TypeOfArrangementAxis = utsi_SharePurchaseAndSalesAgreementMember |  |  |  |  |
Number of shares of common stock repurchased |  |  |  | 1,000,000 utsi_CommonStockRepurchased / us-gaap_CounterpartyNameAxis = utsi_ShahCapitalOpportunityFundLPAndHimanshuHShahMember / us-gaap_TypeOfArrangementAxis = utsi_SharePurchaseAndSalesAgreementMember |  |  |  |  |
Share Purchase Agreement [Member] | Softbank [Member] |  |  |  |  |  |  |  |  |
Repurchase program disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of shares in reporting entity sold by investee |  |  |  | 4,883,875 utsi_InvestmentInReportingEntitySoldByInvesteeNumberOfShares / dei_LegalEntityAxis = utsi_SoftbankAmericaIncMember / us-gaap_TypeOfArrangementAxis = utsi_SharePurchaseAndSalesAgreementMember |  |  |  |  |
Per share price of investment |  |  |  | $ 0.00375 us-gaap_SharePrice / dei_LegalEntityAxis = utsi_SoftbankAmericaIncMember / us-gaap_TypeOfArrangementAxis = utsi_SharePurchaseAndSalesAgreementMember |  |  |  |  |
Subscription Agreement [Member] | Shah Capital [Member] |  |  |  |  |  |  |  |  |
Repurchase program disclosures [Line Items] |  |  |  |  |  |  |  |  |
Share price (in dollars per share) |  |  |  |  | $ 2.67 utsi_StockRepurchaseProgramSharePrice / us-gaap_CounterpartyNameAxis = utsi_ShahCapitalOpportunityFundLPAndHimanshuHShahMember / us-gaap_TypeOfArrangementAxis = utsi_SubscriptionAgreementMember |  |  |  |
Number of shares of common stock issued |  |  |  |  | 2,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_CounterpartyNameAxis = utsi_ShahCapitalOpportunityFundLPAndHimanshuHShahMember / us-gaap_TypeOfArrangementAxis = utsi_SubscriptionAgreementMember |  |  |  |
Par value of shares (in dollars per share) |  |  |  |  | $ 0.00375 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_CounterpartyNameAxis = utsi_ShahCapitalOpportunityFundLPAndHimanshuHShahMember / us-gaap_TypeOfArrangementAxis = utsi_SubscriptionAgreementMember |  |  |  |
Premium percentage |  |  |  |  | 1.30%utsi_CommonStockPremiumPercentage / us-gaap_CounterpartyNameAxis = utsi_ShahCapitalOpportunityFundLPAndHimanshuHShahMember / us-gaap_TypeOfArrangementAxis = utsi_SubscriptionAgreementMember |  |  |  |
Repurchase program, August 2011 [Member] |  |  |  |  |  |  |  |  |
Repurchase program disclosures [Line Items] |  |  |  |  |  |  |  |  |
Maximum ordinary shares outstanding under the repurchase program |  |  |  |  |  | 20,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = utsi_RepurchaseProgramAugust2011Member |  |  |
Period over which shares can be repurchased |  |  |  |  |  | 12 months |  |  |
Shares repurchased under program |  |  | 4,174,875 us-gaap_TreasuryStockNumberOfSharesHeld / us-gaap_ShareRepurchaseProgramAxis = utsi_RepurchaseProgramAugust2011Member |  |  |  | 4,174,875 us-gaap_TreasuryStockNumberOfSharesHeld / us-gaap_ShareRepurchaseProgramAxis = utsi_RepurchaseProgramAugust2011Member |  |
Value of shares repurchased |  |  |  |  |  |  | 15,100,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = utsi_RepurchaseProgramAugust2011Member |  |
Tender offer repurchase program [Member] |  |  |  |  |  |  |  |  |
Repurchase program disclosures [Line Items] |  |  |  |  |  |  |  |  |
Value of shares repurchased |  |  |  |  |  |  |  | 30,000,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = utsi_TenderOfferRepurchaseProgramMember |
Ordinary shares authorized to be repurchased under a tender offer |  |  |  |  |  |  |  | 8,333,333 utsi_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchasedAfterReverseShareSplit / us-gaap_ShareRepurchaseProgramAxis = utsi_TenderOfferRepurchaseProgramMember |
Share price (in dollars per share) |  |  |  |  |  |  |  | $ 3.6 utsi_StockRepurchaseProgramSharePrice / us-gaap_ShareRepurchaseProgramAxis = utsi_TenderOfferRepurchaseProgramMember |
Ordinary shares repurchased |  |  |  |  |  |  |  | 8,333,333 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = utsi_TenderOfferRepurchaseProgramMember |
Repurchase program, November 2014 [Member] |  |  |  |  |  |  |  |  |
Repurchase program disclosures [Line Items] |  |  |  |  |  |  |  |  |
Maximum ordinary shares outstanding under the repurchase program |  |  |  |  |  |  |  |  | 40,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = utsi_RepurchaseProgramNovember2014Member
Period over which shares can be repurchased |  |  |  |  |  |  |  |  | 24 months
Shares repurchased under program | 166,421 us-gaap_TreasuryStockNumberOfSharesHeld / us-gaap_ShareRepurchaseProgramAxis = utsi_RepurchaseProgramNovember2014Member |  |  |  |  |  |  |  |
Value of shares repurchased | $ 400,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = utsi_RepurchaseProgramNovember2014Member |  |  |  |  |  |  |  |

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