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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net loss $ (30,264)us-gaap_ProfitLoss $ (22,730)us-gaap_ProfitLoss $ (35,579)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 2,654us-gaap_DepreciationDepletionAndAmortization 3,464us-gaap_DepreciationDepletionAndAmortization 3,951us-gaap_DepreciationDepletionAndAmortization
Net loss on divestitures    1,307us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal 16,239us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Net loss on disposal of assets 219us-gaap_GainLossOnDispositionOfAssets 3,553us-gaap_GainLossOnDispositionOfAssets 879us-gaap_GainLossOnDispositionOfAssets
Loss (gain) on CTA recognition from liquidation of subsidiaries 121utsi_ForeignCurrencyTranslationAdjustmentGainLossBeforeTax [1] (7,088)utsi_ForeignCurrencyTranslationAdjustmentGainLossBeforeTax [1]    [1]
Change due to reversal of tax payable (992)utsi_TaxProvisionReversal (1,240)utsi_TaxProvisionReversal   
Equity pick up of losses of an associate 8,878us-gaap_IncomeLossFromEquityMethodInvestments 9,586us-gaap_IncomeLossFromEquityMethodInvestments   
Investment impairment 3,947us-gaap_ImpairmentOfInvestments 9,400us-gaap_ImpairmentOfInvestments 3,043us-gaap_ImpairmentOfInvestments
Stock-based compensation expense 2,289us-gaap_ShareBasedCompensation 1,698us-gaap_ShareBasedCompensation 2,981us-gaap_ShareBasedCompensation
Provision for (recovery of) doubtful accounts 49utsi_ProvisionForRecoveryOfDoubtfulAccounts (75)utsi_ProvisionForRecoveryOfDoubtfulAccounts (1,154)utsi_ProvisionForRecoveryOfDoubtfulAccounts
ESA Loan impairment 2,788utsi_ImpairmentOfLoansReceivable      
Deferred income taxes (424)utsi_DeferredIncomeTaxNoncashExpenseBenefit (380)utsi_DeferredIncomeTaxNoncashExpenseBenefit (2,211)utsi_DeferredIncomeTaxNoncashExpenseBenefit
Changes in operating assets and liabilities, net of effect of UiTV deconsolidation and IPTV divestiture      
Accounts receivable 6,332us-gaap_IncreaseDecreaseInAccountsReceivable (14,058)us-gaap_IncreaseDecreaseInAccountsReceivable 664us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories and deferred costs 36,859utsi_IncreaseDecreaseInInventoriesAndDeferredCosts 45,875utsi_IncreaseDecreaseInInventoriesAndDeferredCosts (4,231)utsi_IncreaseDecreaseInInventoriesAndDeferredCosts
Other assets (772)us-gaap_IncreaseDecreaseInOtherOperatingAssets 6,058us-gaap_IncreaseDecreaseInOtherOperatingAssets 17,455us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable 6,415us-gaap_IncreaseDecreaseInAccountsPayable 7,110us-gaap_IncreaseDecreaseInAccountsPayable 9,506us-gaap_IncreaseDecreaseInAccountsPayable
Income taxes payable (3,390)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 110us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 6,393us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Customer advances (25,759)us-gaap_IncreaseDecreaseInCustomerAdvances (12,005)us-gaap_IncreaseDecreaseInCustomerAdvances 9,749us-gaap_IncreaseDecreaseInCustomerAdvances
Deferred revenue (18,788)us-gaap_IncreaseDecreaseInDeferredRevenue (29,524)us-gaap_IncreaseDecreaseInDeferredRevenue (37,760)us-gaap_IncreaseDecreaseInDeferredRevenue
Other liabilities (5,774)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (2,976)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (15,543)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash used in operating activities (15,612)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (1,915)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (25,618)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES:      
Additions to property, plant and equipment (1,298)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,766)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (5,445)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of intangible assets       (54)us-gaap_PaymentsToAcquireIntangibleAssets
Payment on divestitures (804)utsi_PaymentsOnDivestitureOfBusinesses (2,369)utsi_PaymentsOnDivestitureOfBusinesses   
Net proceeds from divestitures    2,000us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested 220us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
Payment for the non-controlling interest on the liquidation of a subsidiary    (898)utsi_PaymentsForDivestitureOfInterestInSubsidiariesAndAffiliates   
Proceeds from settlement of an investment interest, net    569us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates   
Change in restricted cash (3,526)us-gaap_IncreaseDecreaseInRestrictedCash 2,209us-gaap_IncreaseDecreaseInRestrictedCash (1,129)us-gaap_IncreaseDecreaseInRestrictedCash
Purchase of investment interests (1,080)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates (26,592)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates (15,602)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
Proceeds from refund of investment interests 932utsi_ProceedsFromRefundOfInvestmentInterests      
Purchase of short-term investments    (81)us-gaap_PaymentsToAcquireShortTermInvestments (2,267)us-gaap_PaymentsToAcquireShortTermInvestments
Proceeds from sale of short-term investments    379us-gaap_ProceedsFromSaleOfShortTermInvestments 4,300us-gaap_ProceedsFromSaleOfShortTermInvestments
Cash decrease due to deconsolidation of a subsidiary       (6,841)us-gaap_CashDivestedFromDeconsolidation
Payment on divestiture of IPTV business and investment in IPTV convertible bond    (503)utsi_DisposalGroupNotDiscontinuedOperationObligationsPaid (56,010)utsi_DisposalGroupNotDiscontinuedOperationObligationsPaid
Other    162us-gaap_PaymentsForProceedsFromOtherInvestingActivities 80us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (5,776)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (28,890)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (82,748)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES:      
Issuance of ordinary shares 5,340us-gaap_ProceedsFromStockOptionsExercised      
Repurchase of ordinary shares (10,308)us-gaap_PaymentsForRepurchaseOfCommonStock (30,680)us-gaap_PaymentsForRepurchaseOfCommonStock (8,842)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash used in financing activities (4,968)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (30,680)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (8,842)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash and cash equivalents (3,593)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations (10,326)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations (4,834)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
Net decrease in cash and cash equivalents (29,949)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (71,811)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (122,042)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 107,773us-gaap_CashAndCashEquivalentsAtCarryingValue 179,584us-gaap_CashAndCashEquivalentsAtCarryingValue 301,626us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 77,824us-gaap_CashAndCashEquivalentsAtCarryingValue 107,773us-gaap_CashAndCashEquivalentsAtCarryingValue 179,584us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid:      
Interest 88us-gaap_InterestPaid 151us-gaap_InterestPaid 240us-gaap_InterestPaid
Income taxes 5,100us-gaap_IncomeTaxesPaid 1,600us-gaap_IncomeTaxesPaid 3,000us-gaap_IncomeTaxesPaid
Non-cash operating activities      
Purchase UiTV convertible bond through converting of outstanding receivables    7,114utsi_NoncashOperatingActivitiesPurchaseOfConvertibleBondThroughConversionOfOutstandingReceivables   
Non-cash investing activities      
Repurchase of ordinary shares from UiTV shareholder       (5,278)utsi_TreasuryStockValueAcquiredFromSubsidiaryShareholdersCostMethod
Accrual related to purchase of property, plant and equipment 13us-gaap_CapitalExpendituresIncurredButNotYetPaid 530us-gaap_CapitalExpendituresIncurredButNotYetPaid 1,911us-gaap_CapitalExpendituresIncurredButNotYetPaid
Purchase UiTV convertible bond through converting of outstanding receivables    (7,114)utsi_NoncashInvestingActivitiesPurchaseOfConvertibleBondThroughConversionOfOutstandingReceivables   
Disposal of short-term investments through exchanging of equity investment 1,826utsi_NoncashInvestingActivitiesDisposalOfShortTermInvestmentsThroughExchangingOfEquityInvestment      
Acquisition of short-term investments through exchanging of equity investment $ (1,826)utsi_NoncashInvestingActivitiesShortTermInvestments      
[1] During 2013, the Company recognized $7.1 million gain in the Consolidated Statements of Operations and Comprehensive Income (Loss) on the reversal of the cumulative translation adjustment previously recorded in accumulated other comprehensive income upon the liquidation of two previously inactive Chinese entities. The prior cumulative translation adjustment primarily resulted from the difference between local functional currency and the Company's reporting currency.