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COMMON STOCK AND STOCK INCENTIVE PLANS (Stock Incentive Plans - Narrative) (Details)
12 Months Ended
Dec. 31, 2014
Minimum [Member]  
COMMON STOCK AND STOCK INCENTIVE PLANS [Line Items]  
Vesting period 1 year
Maximum [Member]  
COMMON STOCK AND STOCK INCENTIVE PLANS [Line Items]  
Vesting period 4 years
2006 Equity Incentive Plan [Member]  
COMMON STOCK AND STOCK INCENTIVE PLANS [Line Items]  
Number of shares authorized 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= utsi_EquityIncentivePlan2006Member
Number of shares transferred from the prior plan 8,474,347utsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesTransferredFromPriorPlans
/ us-gaap_PlanNameAxis
= utsi_EquityIncentivePlan2006Member
2006 Equity Incentive Plan [Member] | Options and restricted stock units [Member]  
COMMON STOCK AND STOCK INCENTIVE PLANS [Line Items]  
Number of awards outstanding (in shares) 1,783,638utsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOutstandingNumber
/ us-gaap_AwardTypeAxis
= utsi_StockOptionsAndRestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= utsi_EquityIncentivePlan2006Member
2006 Equity Incentive Plan [Member] | Stock options [Member]  
COMMON STOCK AND STOCK INCENTIVE PLANS [Line Items]  
Vesting period 4 years
2006 Equity Incentive Plan [Member] | Stock options [Member] | Maximum [Member]  
COMMON STOCK AND STOCK INCENTIVE PLANS [Line Items]  
Expiration term 7 years
2006 Equity Incentive Plan [Member] | Stock options and stock appreciation rights [Member] | Minimum [Member]  
COMMON STOCK AND STOCK INCENTIVE PLANS [Line Items]  
Exercise price as a percentage of the fair market value of an ordinary share on the date of grant 100.00%utsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisePriceAsPercentageOfFairValueOfCommonStockOnDateOfGrant
/ us-gaap_AwardTypeAxis
= utsi_StockOptionsAndStockAppreciationRightsMember
/ us-gaap_PlanNameAxis
= utsi_EquityIncentivePlan2006Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
2006 Equity Incentive Plan [Member] | ISO [Member] | Minimum [Member]  
COMMON STOCK AND STOCK INCENTIVE PLANS [Line Items]  
Exercise price as a percentage of the fair market value of an ordinary share on the date of grant 110.00%utsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisePriceAsPercentageOfFairValueOfCommonStockOnDateOfGrant
/ us-gaap_AwardTypeAxis
= utsi_IncentiveStockOptionMember
/ us-gaap_PlanNameAxis
= utsi_EquityIncentivePlan2006Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Percentage of voting power required of the company's stock for specified exercise price 10.00%utsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfVotingPowerInEntitysCommonStockRequiredForSpecifiedExercisePrice
/ us-gaap_AwardTypeAxis
= utsi_IncentiveStockOptionMember
/ us-gaap_PlanNameAxis
= utsi_EquityIncentivePlan2006Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
2006 Equity Incentive Plan [Member] | ISO [Member] | Maximum [Member]  
COMMON STOCK AND STOCK INCENTIVE PLANS [Line Items]  
Expiration term 5 years
Percentage of voting power required of the company's stock for specified vesting period 10.00%utsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfVotingPowerInEntitysCommonStockRequiredForSpecifiedVestingPeriod
/ us-gaap_AwardTypeAxis
= utsi_IncentiveStockOptionMember
/ us-gaap_PlanNameAxis
= utsi_EquityIncentivePlan2006Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember