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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS (Equity Method Investments - Narrative) (Details) (USD $)
 12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Jun. 30, 2011
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]          
Gain (loss) recognized on initial investment $ (2,788,000)us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal [1]    [1]    [1]    
ACELAND [Member]          
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]          
Payments to acquire interest in joint venture       2,100,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ invest_InvestmentIssuerAxis
= utsi_AcelandMember		  
Contribution of equity investment through a shareholder loan         $ 7,100,000us-gaap_PaymentsForAdvanceToAffiliate
/ invest_InvestmentIssuerAxis
= utsi_AcelandMember
Equity method investment, ownership interest (as a percent) 35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentIssuerAxis
= utsi_AcelandMember		        
ACELAND [Member] | Wireless City Planning [Member]          
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items]          
Equity method investment, ownership interest (as a percent) 5.82%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentIssuerAxis
= utsi_AcelandMember
/ dei_LegalEntityAxis
= utsi_WirelessCityPlanningMember		        
[1] The Company signed the loan agreement to for a total amount of $5.6 million in the fourth quarter of 2012, $4.0 million was drawdown in the fourth quarter of 2012 and the remaining in the first quarter of 2013. The loan bears interest at 20% per annum and originally matured on December 31, 2013, with subsequently extended the maturity date on 50% of the loan, or $2.8 million, to June 30, 2014, and the other half extended to December 31, 2014. In the fourth quarter of 2014, the Company received $0.8 million. The Company has performed an assessment on the need for a valuation reserve and $2.8 million was charged as impairment in other expenses in 2014 as the collection term was due. The management expects to collect the remaining $2.0 million balance in the second quarter of 2015.