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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 ($)
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

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

X

- Definition

Represents the amount of deferred cost related to un-assigned contracts.

+ References

No definition available.

+ Details

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Namespace Prefix:	utsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

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Data Type:	na
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- Details

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Data Type:	na
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