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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 - UTStarcom Hong Kong Ltd.) (Details) (UTStarcom Hong Kong Holdings Ltd. [Member], UTStarcom Hong Kong Ltd. [Member], Convertible Bond [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Binomial-Model [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Total fair value of invested capital as at valuation date	$ 37,000us-gaap_FairValueOfAssetsAcquired / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / dei_LegalEntityAxis = utsi_UTStarcomHongKongLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember / us-gaap_ValuationTechniqueAxis = utsi_BinomialModelMember
Risk-free interest rate (as a percent)	1.69%us-gaap_FairValueAssumptionsRiskFreeInterestRate / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / dei_LegalEntityAxis = utsi_UTStarcomHongKongLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember / us-gaap_ValuationTechniqueAxis = utsi_BinomialModelMember
Dividend yield (as a percent)	4.00%us-gaap_FairValueAssumptionsExpectedDividendRate / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / dei_LegalEntityAxis = utsi_UTStarcomHongKongLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember / us-gaap_ValuationTechniqueAxis = utsi_BinomialModelMember
Volatility rate (as a percent)	49.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / dei_LegalEntityAxis = utsi_UTStarcomHongKongLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember / us-gaap_ValuationTechniqueAxis = utsi_BinomialModelMember
Discounted cash flow model [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Dividend yield (as a percent)	4.00%us-gaap_FairValueAssumptionsExpectedDividendRate / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / dei_LegalEntityAxis = utsi_UTStarcomHongKongLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember / us-gaap_ValuationTechniqueAxis = utsi_DiscountedCashFlowModelMember
Discount rate (as a percent)	40.00%us-gaap_FairValueInputsDiscountRate / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / dei_LegalEntityAxis = utsi_UTStarcomHongKongLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember / us-gaap_ValuationTechniqueAxis = utsi_DiscountedCashFlowModelMember
Estimated debt to equity ratio	1utsi_EstimatedDebtToEquityRatio / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / dei_LegalEntityAxis = utsi_UTStarcomHongKongLtdMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember / us-gaap_ValuationTechniqueAxis = utsi_DiscountedCashFlowModelMember

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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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

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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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- 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

+ Details

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Namespace Prefix:	us-gaap_
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X

- 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the estimated debt to equity ratio for the purpose of calculating dividend yield.

+ References

No definition available.

+ Details

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