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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS (Schedule of Significant Inputs for the Valuation Model used to Estimate Fair Value of Investments - UiTV Media Inc. or UiTV) (Details) (UiTV Media Inc. or UiTV [Member], Convertible Bond [Member], Equity Method [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
UiTV Media Inc. or UiTV [Member] | Convertible Bond [Member] | Equity Method [Member]
Significant inputs for the valuation model used to estimate fair value of investments
Total fair value of invested capital as at valuation date	$ 20,000us-gaap_FairValueOfAssetsAcquired / invest_InvestmentIssuerAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
Discount rate (as a percent)	40.00%us-gaap_FairValueInputsDiscountRate / invest_InvestmentIssuerAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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The fair value of assets acquired in noncash investing or financing activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586



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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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