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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Product Warranty - Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Product Warranty: |  |  |
Warranty accrual reversals | $ 0.1 utsi_WarrantyAccrualReversals | $ 0.1 utsi_WarrantyAccrualReversals | $ 0.3 utsi_WarrantyAccrualReversals
Minimum [Member] |  |  |
Product Warranty: |  |  |
Warranty period | 1 year |  |
Period after sales to provide limited warranty services | 2 years |  |
Maximum [Member] |  |  |
Product Warranty: |  |  |
Warranty period | 2 years |  |

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

X
- Definition Represent the period after the sales then the entity provides limited warranty services. + References No definition available. + Details
Name: | utsi_PeriodAfterSalesStandardProductWarrantyLimitedServices
Namespace Prefix: | utsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period of standard product warranty. + References No definition available. + Details
Name: | utsi_StandardProductWarrantyPeriod
Namespace Prefix: | utsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents product warranty accrual reversals during the period. + References No definition available. + Details
Name: | utsi_WarrantyAccrualReversals
Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |