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v3.19.1

DIVESTITURES - Liabilities and Assets Related to Un-Assigned Contracts (Details) - Disposed of by sale, not discontinued operations - IPTV divestiture $ in Millions | Dec. 31, 2018 USD ($)
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DIVESTITURES |
Deferred costs related to un-assigned contracts | $ 0
Liabilities associated with the un-assigned contracts | $ 0

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

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- Definition Represents the amount of deferred cost related to un-assigned contracts. + References No definition available. + Details
Name: | utsi_DeferredCostRelatedToUnassignedContracts
Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the amount of liability related to un-assigned contracts. + References No definition available. + Details
Name: | utsi_LiabilityRelatedToUnassignedContracts
Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=utsi_IPTVOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |