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ACQUISITION - Schedule of Purchase Price Allocation (Parenthetical) (Details) | 1 Months Ended
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Dec. 31, 2018
uSTAR |
Business Acquisition [Line Items] |
Purchase price percentage | 51.00%

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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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Business combination recognized identifiable assets acquired and liabilities assumed net purchase price, percentage. + References No definition available. + Details
Name: | utsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetPurchasePricePercentage
Namespace Prefix: | utsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=utsi_HangzhouUstarTechnologiesLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |