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BALANCE SHEET DETAILS (Schedule of Prepaid and Other Current Assets) (Details) (USD $)
 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2013
Aug. 31, 2014
Jul. 31, 2014
Prepaids and other current assets            
Prepaid tax $ 4,323,000us-gaap_PrepaidTaxes $ 4,323,000us-gaap_PrepaidTaxes   $ 4,894,000us-gaap_PrepaidTaxes    
Advance to suppliers 1,944,000us-gaap_AdvancesOnInventoryPurchases 1,944,000us-gaap_AdvancesOnInventoryPurchases   223,000us-gaap_AdvancesOnInventoryPurchases    
Deferred taxes-current 3,668,000us-gaap_DeferredTaxAssetsNetCurrent 3,668,000us-gaap_DeferredTaxAssetsNetCurrent   3,534,000us-gaap_DeferredTaxAssetsNetCurrent    
Other receivable 4,413,000us-gaap_OtherAssetsCurrent [1] 4,413,000us-gaap_OtherAssetsCurrent [1]   8,579,000us-gaap_OtherAssetsCurrent [1]    
Prepaid others 4,989,000us-gaap_OtherPrepaidExpenseCurrent 4,989,000us-gaap_OtherPrepaidExpenseCurrent   4,322,000us-gaap_OtherPrepaidExpenseCurrent    
Total Prepaids and other current assets 19,337,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 19,337,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent   21,552,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent    
Other receivables [Line Items]            
Amount of other receivable expects to be collected 2,000,000utsi_AmountOfOtherReceivableExpectsToBeCollected          
ESA Cultural Investment (Hong Kong) limited [Member]            
Other receivables [Line Items]            
Proceeds from loan payments 2,000,000us-gaap_ProceedsFromCollectionOfLoansReceivable
/ us-gaap_CounterpartyNameAxis
= utsi_ESaCulturalInvestmentMember		 800,000us-gaap_ProceedsFromCollectionOfLoansReceivable
/ us-gaap_CounterpartyNameAxis
= utsi_ESaCulturalInvestmentMember		   5,600,000us-gaap_ProceedsFromCollectionOfLoansReceivable
/ us-gaap_CounterpartyNameAxis
= utsi_ESaCulturalInvestmentMember		    
Loan amount reseved due to collectability risk 2,800,000us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_CounterpartyNameAxis
= utsi_ESaCulturalInvestmentMember		 2,800,000us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_CounterpartyNameAxis
= utsi_ESaCulturalInvestmentMember		        
Loan receivable     5,600,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_CounterpartyNameAxis
= utsi_ESaCulturalInvestmentMember		      
Amount drawn   800,000us-gaap_PaymentsForProceedsFromLoansReceivable
/ us-gaap_CounterpartyNameAxis
= utsi_ESaCulturalInvestmentMember		 4,000,000us-gaap_PaymentsForProceedsFromLoansReceivable
/ us-gaap_CounterpartyNameAxis
= utsi_ESaCulturalInvestmentMember		      
Percentage of loan receivable on extended maturity date 50.00%utsi_PercentageOfLoanGrossCarryingAmountOfExtendedMaturityDate
/ us-gaap_CounterpartyNameAxis
= utsi_ESaCulturalInvestmentMember		          
Loan receivable on extended maturity date 2,800,000utsi_LoansReceivableGrossCarryingAmountOfExtendedMaturityDate
/ us-gaap_CounterpartyNameAxis
= utsi_ESaCulturalInvestmentMember		 2,800,000utsi_LoansReceivableGrossCarryingAmountOfExtendedMaturityDate
/ us-gaap_CounterpartyNameAxis
= utsi_ESaCulturalInvestmentMember		        
Interest rate of debt securities (as a percent) 20.00%invest_InvestmentInterestRate
/ us-gaap_CounterpartyNameAxis
= utsi_ESaCulturalInvestmentMember		          
UiTV Media Inc [Member]            
Other receivables [Line Items]            
Amount paid to equity method investee         $ 1,800,000utsi_PaymentsToEquityMethodInvestee
/ us-gaap_CounterpartyNameAxis
= utsi_UiTVMediaIncMember		 $ 1,080,000utsi_PaymentsToEquityMethodInvestee
/ us-gaap_CounterpartyNameAxis
= utsi_UiTVMediaIncMember
[1] The other receivable balance includes loans of approximately $2.0 million and $5.6 million as of December 31, 2014 and December 31, 2013, respectively, made to ESA Cultural Investment (Hong Kong) limited (“borrower” or ESA), a movie investment company with its operations located in Beijing. The Company signed the loan agreement for a total amount of $5.6 million in the fourth quarter of 2012, and $4.0 million was drawdown in the fourth quarter of 2012 with the remaining in the first quarter of 2013. The loan bears interest at 20% per annum and originally matured on December 31, 2013, with a subsequently extended 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 against the principal of the outstanding entrusted loan amount. The Company has performed an assessment on the need for a valuation reserve due to collectability risk and $2.8 million was reserved as of December 31, 2014 as the collection term was due. The management expects to collect the remaining $2.0 million balance in the second quarter of 2015.