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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranty (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Product Warranty |  |  |
Warranty accrual reversals | $ 0.1 | $ 0.0 | $ 0.1
Minimum |  |  |
Product Warranty |  |  |
Warranty period | 1 year |  |
Period after sales to provide limited warranty services | 2 years |  |
Maximum |  |  |
Product Warranty |  |  |
Warranty period | 2 years |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ProductWarrantyLiabilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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

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- 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: | debit
Period Type: | duration

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

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