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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 | $ 11,700,000 us-gaap_DeferredRevenue | $ 10,200,000 us-gaap_DeferredRevenue | $ 9,800,000 us-gaap_DeferredRevenue | $ 9,800,000 us-gaap_DeferredRevenue |  |
Deferred service costs related to unassigned contracts | 5,700,000 us-gaap_DeferredCostsCurrentAndNoncurrent | 5,300,000 us-gaap_DeferredCostsCurrentAndNoncurrent | 6,100,000 us-gaap_DeferredCostsCurrentAndNoncurrent | 6,100,000 us-gaap_DeferredCostsCurrentAndNoncurrent |  |
Revenues relating to unassigned contracts | 129,420,000 us-gaap_SalesRevenueNet | 164,439,000 us-gaap_SalesRevenueNet | 186,728,000 us-gaap_SalesRevenueNet |  |  |
Current deferred revenue | 26,819,000 us-gaap_DeferredRevenueCurrent | 29,093,000 us-gaap_DeferredRevenueCurrent |  |  |  |
Long-term deferred revenue | 18,304,000 us-gaap_DeferredRevenueNoncurrent | 35,251,000 us-gaap_DeferredRevenueNoncurrent |  |  |  |
IPTV operations [Member] |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |
Deferred revenue |  |  | 5,100,000 us-gaap_DeferredRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember | 5,100,000 us-gaap_DeferredRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember | 10,000,000 us-gaap_DeferredRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |
Deferred service costs related to unassigned contracts |  |  |  |  | 22,700,000 us-gaap_DeferredCostsCurrentAndNoncurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |
Liabilities and deferred costs related to un-assigned contracts | 21,500,000 utsi_RevenueRecognitionLiabilityAndDeferredCostRelatedToUnassignedContracts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |  |  | 47,300,000 utsi_RevenueRecognitionLiabilityAndDeferredCostRelatedToUnassignedContracts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |
Revenues relating to unassigned contracts | 4,300,000 us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember | 1,400,000 us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember | 29,500,000 us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember | 2,200,000 us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = utsi_IPTVOperationsMember |  |
PAS infrastructure contracts [Member] |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |
Deferred revenue |  |  |  |  |  | 13,200,000 us-gaap_DeferredRevenue / us-gaap_TypeOfArrangementAxis = utsi_PASInfrastructureContractsMember
Deferred revenue released |  |  | $ 8,100,000 us-gaap_DeferredRevenueRevenueRecognized / us-gaap_TypeOfArrangementAxis = utsi_PASInfrastructureContractsMember |  |  |

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