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CREDIT RISK AND CONCENTRATION (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CREDIT RISK AND CONCENTRATION [Abstract]
Increase or decrease in interest rates of short-term investments that will not significantly affect the fair value of investment portfolio (as a percent)	10.00%utsi_CreditRiskIncreaseDecreaseInInterestRateThatWillNotAffectValueOfInvestmentPortfolio
Credit risk and concentration [Line Items]
Accounts receivable balances	16,690,000us-gaap_AccountsReceivableNetCurrent	23,260,000us-gaap_AccountsReceivableNetCurrent
Credit risk concentration [Member] | Cash, Cash Equivalents and Short Term Investments [Member] | Countries outside US [Member]
Credit risk and concentration [Line Items]
Cash and cash equivalents and short-term investments	55,300,000us-gaap_CashCashEquivalentsAndShortTermInvestments / utsi_AllCountriesAxis = utsi_CountriesOtherThanUSMember / us-gaap_ConcentrationRiskByBenchmarkAxis = utsi_CashCashEquivalentsAndShortTermInvestmentsMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember	56,500,000us-gaap_CashCashEquivalentsAndShortTermInvestments / utsi_AllCountriesAxis = utsi_CountriesOtherThanUSMember / us-gaap_ConcentrationRiskByBenchmarkAxis = utsi_CashCashEquivalentsAndShortTermInvestmentsMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember
Credit risk concentration [Member] | Cash, Cash Equivalents and Short Term Investments [Member] | China [Member] | Subsidiary [Member]
Credit risk and concentration [Line Items]
Cash and cash equivalents and short-term investments	14,500,000us-gaap_CashCashEquivalentsAndShortTermInvestments / utsi_AllCountriesAxis = country_CN / us-gaap_ConcentrationRiskByBenchmarkAxis = utsi_CashCashEquivalentsAndShortTermInvestmentsMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	11,500,000us-gaap_CashCashEquivalentsAndShortTermInvestments / utsi_AllCountriesAxis = country_CN / us-gaap_ConcentrationRiskByBenchmarkAxis = utsi_CashCashEquivalentsAndShortTermInvestmentsMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Customer concentration [Member] | Accounts receivable [Member] | Affiliates of Softbank [Member]
Credit risk and concentration [Line Items]
Concentration of risk (as a percent)	65.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = utsi_AffiliatesOfSoftbankMember	82.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = utsi_AffiliatesOfSoftbankMember
Customer concentration [Member] | Accounts receivable [Member] | China government affiliated entities [Member]
Credit risk and concentration [Line Items]
Accounts receivable balances	6,000,000us-gaap_AccountsReceivableNetCurrent / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = utsi_ChinaGovernmentAffiliatedEntitiesMember	6,300,000us-gaap_AccountsReceivableNetCurrent / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = utsi_ChinaGovernmentAffiliatedEntitiesMember
Customer concentration [Member] | Net revenues [Member] | Affiliates of Softbank [Member]
Credit risk and concentration [Line Items]
Concentration of risk (as a percent)	44.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = utsi_AffiliatesOfSoftbankMember	55.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = utsi_AffiliatesOfSoftbankMember	49.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = utsi_AffiliatesOfSoftbankMember
Customer concentration [Member] | Net revenues [Member] | China government affiliated entities [Member]
Credit risk and concentration [Line Items]
Concentration of risk (as a percent)	0.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = utsi_ChinaGovernmentAffiliatedEntitiesMember	1.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = utsi_ChinaGovernmentAffiliatedEntitiesMember	18.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = utsi_ChinaGovernmentAffiliatedEntitiesMember
Country risks [Member] | Net revenues [Member] | China [Member]
Credit risk and concentration [Line Items]
Concentration of risk (as a percent)	12.00%us-gaap_ConcentrationRiskPercentage1 / utsi_AllCountriesAxis = country_CN / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember	4.00%us-gaap_ConcentrationRiskPercentage1 / utsi_AllCountriesAxis = country_CN / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember	21.00%us-gaap_ConcentrationRiskPercentage1 / utsi_AllCountriesAxis = country_CN / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember

X

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ 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 210.5-02.3-4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph a(1)

-Article 5



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951



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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016



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-Name Regulation S-X (SX)

-Number 210

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

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- Definition

Represents the percentage of increase or decrease in interest rates of short-term investments that will not significantly affect the fair value of investment portfolio.

+ References

No definition available.

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