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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Goodwill and Intangible Assets, Other than Temporary Impairment on Investment, Advertising Costs, Third Party Commissions and Foreign Currency Translation - Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
Goodwill and Intangible Assets      
Amortization of intangible assets       $ 516,000us-gaap_AmortizationOfIntangibleAssets
Other than Temporary Impairment on Investment      
Investment impairment 3,947,000us-gaap_ImpairmentOfInvestments 9,400,000us-gaap_ImpairmentOfInvestments 3,043,000us-gaap_ImpairmentOfInvestments
Advertising Costs      
Advertising costs 100,000us-gaap_AdvertisingExpense 100,000us-gaap_AdvertisingExpense 200,000us-gaap_AdvertisingExpense
Foreign Currency Translation      
Less: Gain (loss) reclassified from AOCI to income 121,000us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax (7,088,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax  
Number of chinese entities 3utsi_NumberOfInactiveChineseEntities 2utsi_NumberOfInactiveChineseEntities  
Gain (loss) on foreign currency translation $ (586,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ 3,856,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ (4,675,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax