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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred Costs (Details) $ in Thousands	Dec. 31, 2018 USD ($)
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

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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

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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

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