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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS (Schedule of Total Long-term Investments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments	$ 59,799us-gaap_LongTermInvestments	$ 74,588us-gaap_LongTermInvestments
Cost Method [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments	2,371us-gaap_LongTermInvestments / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember	6,081us-gaap_LongTermInvestments / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember
Cost Method [Member] | Cortina [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments		3,348us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_CortinaMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember
Cost Method [Member] | GCT Semiconductor, Inc. [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments	811us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_GctSemiconductorIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember	811us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_GctSemiconductorIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember
Cost Method [Member] | Xalted Networks [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments		22us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_XaltedNetworksMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember
Cost Method [Member] | SBI [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments	1,560us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_SbiMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember	1,900us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_SbiMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_CostmethodInvestmentsMember
Equity Method [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments	9,228us-gaap_LongTermInvestments / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember	14,536us-gaap_LongTermInvestments / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember
Equity Method [Member] | UiTV Media Inc [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments		5,308us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember
Equity Method [Member] | ACELAND [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments	2,109us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_AcelandMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember	2,109us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_AcelandMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember
Equity Method [Member] | Shareholder Loan to ACELAND [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments	7,119us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_ShareholderLoanToAcelandMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember	7,119us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_ShareholderLoanToAcelandMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember
Available for sale [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments	48,200us-gaap_LongTermInvestments / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember	53,971us-gaap_LongTermInvestments / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember
Available for sale [Member] | UiTV Media Inc [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments	20,000us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember	25,971us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember
Available for sale [Member] | AioTV [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments	8,000us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_AioTVIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember	8,000us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_AioTVIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember
Available for sale [Member] | UTStarcom Hong Kong Holdings Ltd. [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]
Long-term investments	$ 20,200us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember	$ 20,000us-gaap_LongTermInvestments / invest_InvestmentIssuerAxis = utsi_UTStarcomHongKongHoldingsLtdMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember

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- Definition

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

+ 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 210.5-02.12)

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

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