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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenue Recognition - Narrative) (Details) (USD $)
12 Months Ended 4 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2012
Aug. 31, 2012
Dec. 31, 2011
Revenue Recognition [Line Items]            
Deferred revenue $ 11,700,000us-gaap_DeferredRevenue $ 10,200,000us-gaap_DeferredRevenue $ 9,800,000us-gaap_DeferredRevenue $ 9,800,000us-gaap_DeferredRevenue    
Deferred service costs related to unassigned contracts 5,700,000us-gaap_DeferredCostsCurrentAndNoncurrent 5,300,000us-gaap_DeferredCostsCurrentAndNoncurrent 6,100,000us-gaap_DeferredCostsCurrentAndNoncurrent 6,100,000us-gaap_DeferredCostsCurrentAndNoncurrent    
Revenues relating to unassigned contracts 129,420,000us-gaap_SalesRevenueNet 164,439,000us-gaap_SalesRevenueNet 186,728,000us-gaap_SalesRevenueNet      
Current deferred revenue 26,819,000us-gaap_DeferredRevenueCurrent 29,093,000us-gaap_DeferredRevenueCurrent        
Long-term deferred revenue 18,304,000us-gaap_DeferredRevenueNoncurrent 35,251,000us-gaap_DeferredRevenueNoncurrent        
IPTV operations [Member]            
Revenue Recognition [Line Items]            
Deferred revenue     5,100,000us-gaap_DeferredRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= utsi_IPTVOperationsMember
5,100,000us-gaap_DeferredRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= utsi_IPTVOperationsMember
10,000,000us-gaap_DeferredRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= utsi_IPTVOperationsMember
 
Deferred service costs related to unassigned contracts         22,700,000us-gaap_DeferredCostsCurrentAndNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= utsi_IPTVOperationsMember
 
Liabilities and deferred costs related to un-assigned contracts 21,500,000utsi_RevenueRecognitionLiabilityAndDeferredCostRelatedToUnassignedContracts
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= utsi_IPTVOperationsMember
      47,300,000utsi_RevenueRecognitionLiabilityAndDeferredCostRelatedToUnassignedContracts
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= utsi_IPTVOperationsMember
 
Revenues relating to unassigned contracts 4,300,000us-gaap_SalesRevenueNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= utsi_IPTVOperationsMember
1,400,000us-gaap_SalesRevenueNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= utsi_IPTVOperationsMember
29,500,000us-gaap_SalesRevenueNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= utsi_IPTVOperationsMember
2,200,000us-gaap_SalesRevenueNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= utsi_IPTVOperationsMember
   
PAS infrastructure contracts [Member]            
Revenue Recognition [Line Items]            
Deferred revenue           13,200,000us-gaap_DeferredRevenue
/ us-gaap_TypeOfArrangementAxis
= utsi_PASInfrastructureContractsMember
Deferred revenue released     $ 8,100,000us-gaap_DeferredRevenueRevenueRecognized
/ us-gaap_TypeOfArrangementAxis
= utsi_PASInfrastructureContractsMember