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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred Costs (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Accounting Policies [Abstract] |
Liabilities related to remaining un-assigned contracts due to expiration of legal obligation | $ 0
Deferred costs related to remaining un-assigned contracts due to expiration of legal obligation | $ 0

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Deferred cost related to remaining unassigned contracts due to expiration of legal obligations. + References No definition available. + Details
Name: | utsi_DeferredCostRelatedToRemainingUnassignedContractsDueToExpirationOfLegalObligations
Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Liability related to remaining unassigned contracts due to expiration of legal obligations. + References No definition available. + Details
Name: | utsi_LiabilityRelatedToRemainingUnassignedContractsDueToExpirationOfLegalObligations
Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant