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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 - AioTV Inc.) (Details) (AioTV [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
AioTV [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Total fair value of invested capital as at valuation date	$ 11,954us-gaap_FairValueOfAssetsAcquired / invest_InvestmentIssuerAxis = utsi_AioTVIncMember
Risk free rate of interest (as a percent)	1.70%us-gaap_FairValueAssumptionsRiskFreeInterestRate / invest_InvestmentIssuerAxis = utsi_AioTVIncMember
Dividend yield (as a percent)	0.00%us-gaap_FairValueAssumptionsExpectedDividendRate / invest_InvestmentIssuerAxis = utsi_AioTVIncMember
Volatility (as a percent)	55.50%us-gaap_FairValueAssumptionsExpectedVolatilityRate / invest_InvestmentIssuerAxis = utsi_AioTVIncMember
Discount rate (as a percent)	32.00%us-gaap_FairValueInputsDiscountRate / invest_InvestmentIssuerAxis = utsi_AioTVIncMember

X

- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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X

- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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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

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

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

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586



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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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