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BALANCE SHEET DETAILS (Schedule of Other Current Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other current liabilities:    
Accrued contract costs $ 3,638utsi_AccruedContractCostsCurrent $ 3,175utsi_AccruedContractCostsCurrent
Accrued payroll and compensation 4,705us-gaap_EmployeeRelatedLiabilitiesCurrent 8,136us-gaap_EmployeeRelatedLiabilitiesCurrent
Warranty costs 217us-gaap_ProductWarrantyAccrualClassifiedCurrent 617us-gaap_ProductWarrantyAccrualClassifiedCurrent
Accrued professional fees 816us-gaap_AccruedProfessionalFeesCurrent 1,946us-gaap_AccruedProfessionalFeesCurrent
Accrued other taxes 2,495us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 2,722us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Other 3,592us-gaap_OtherAccruedLiabilitiesCurrent 5,834us-gaap_OtherAccruedLiabilitiesCurrent
Total other current liabilities $ 15,463us-gaap_OtherLiabilitiesCurrent $ 22,430us-gaap_OtherLiabilitiesCurrent