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LONG-LIVED ASSETS (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 sqm
LONG-LIVED ASSETS |
Gross floor area leased (in square meters) | 35,425
Annual lease payment | $ 1.6
Escalation rate (as a percent) | 9.00%
Specified year from entering into lease from which escalation rate clause will be applicable | 4 years
Security deposit required to be paid | $ 0.5
Advance notice period for termination of all or part of the lease | 6 months

X
- Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the advance notice period for termination of the lease under the noncancelable lease agreement. + References No definition available. + Details
Name: | utsi_OperatingLeaseAdvanceNoticePeriodForTerminationOfLease
Namespace Prefix: | utsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents an escalation rate under operating leases. + References No definition available. + Details
Name: | utsi_OperatingLeasesEscalationRate
Namespace Prefix: | utsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the gross floor area leased under the noncancelable lease agreement entered into by the entity. + References No definition available. + Details
Name: | utsi_OperatingLeasesGrossFloorAreaLeased
Namespace Prefix: | utsi_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Annual lease payment under the terms of the operating lease. + References No definition available. + Details
Name: | utsi_OperatingLeasesRentAnnualPayment
Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of the noncancelable lease agreement. + References No definition available. + Details
Name: | utsi_OperatingLeasesSecurityDeposit
Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the specified year from which escalation rate clause will apply. + References No definition available. + Details
Name: | utsi_OperatingLeasesSpecifiedPeriodFromWhichEscalationRateClauseWillBeApplicable
Namespace Prefix: | utsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration