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CREDIT RISK AND CONCENTRATION (Narrative) (Details) (USD $) | 12 Months Ended
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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 | 16,690,000 us-gaap_AccountsReceivableNetCurrent | 23,260,000 us-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 | 55,300,000 us-gaap_CashCashEquivalentsAndShortTermInvestments / utsi_AllCountriesAxis = utsi_CountriesOtherThanUSMember / us-gaap_ConcentrationRiskByBenchmarkAxis = utsi_CashCashEquivalentsAndShortTermInvestmentsMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember | 56,500,000 us-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 | 14,500,000 us-gaap_CashCashEquivalentsAndShortTermInvestments / utsi_AllCountriesAxis = country_CN / us-gaap_ConcentrationRiskByBenchmarkAxis = utsi_CashCashEquivalentsAndShortTermInvestmentsMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 11,500,000 us-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 | 6,000,000 us-gaap_AccountsReceivableNetCurrent / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = utsi_ChinaGovernmentAffiliatedEntitiesMember | 6,300,000 us-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

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- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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. + Details
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