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BASIS OF PRESENTATION AND LIQUIDITY (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
BASIS OF PRESENTATION AND LIQUIDITY [Abstract]
Net losses	$ (30,264)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (22,721)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (34,385)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net cash outflows from operations	15,612us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1,915us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	25,618us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash and cash equivalents [Line Items]
Cash and cash equivalents	77,824us-gaap_CashAndCashEquivalentsAtCarryingValue	107,773us-gaap_CashAndCashEquivalentsAtCarryingValue	179,584us-gaap_CashAndCashEquivalentsAtCarryingValue	301,626us-gaap_CashAndCashEquivalentsAtCarryingValue
Accumulated deficit	1,206,286us-gaap_RetainedEarningsAccumulatedDeficit	1,176,022us-gaap_RetainedEarningsAccumulatedDeficit
Subsidiaries [Member] | China [Member]
Cash and cash equivalents [Line Items]
Cash and cash equivalents	14,500us-gaap_CashAndCashEquivalentsAtCarryingValue / utsi_AllCountriesAxis = country_CN / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	11,500us-gaap_CashAndCashEquivalentsAtCarryingValue / utsi_AllCountriesAxis = country_CN / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Accumulated deficit	$ 0us-gaap_RetainedEarningsAccumulatedDeficit / utsi_AllCountriesAxis = country_CN / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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