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WARRANTY OBLIGATIONS AND OTHER GUARANTEES (Summary of the Activity Related to Warranty Obligations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
WARRANTY OBLIGATIONS AND OTHER GUARANTEES [Abstract]
Standard product warranty term, minimum	1 year
Standard product warranty term, maximum	2 years
Limited warranty services term, minimum	2 years
Activity related to warranty obligations
Balance at the beginning of the period	$ 617us-gaap_StandardProductWarrantyAccrual	$ 1,329us-gaap_StandardProductWarrantyAccrual	$ 4,660us-gaap_StandardProductWarrantyAccrual
Accruals for warranties issued during the period (benefit from expirations), net	(250)utsi_StandardProductWarrantyAccrualWarrantiesIssuedAndBenefitFromExpirationsNet	(473)utsi_StandardProductWarrantyAccrualWarrantiesIssuedAndBenefitFromExpirationsNet	2,039utsi_StandardProductWarrantyAccrualWarrantiesIssuedAndBenefitFromExpirationsNet
Warranty reserve derecognized upon IPTV divestiture			(2,507)utsi_StandardProductWarrantyAccrualWarrantiesReversed
Settlements made during the period	(150)us-gaap_StandardProductWarrantyAccrualPayments	(239)us-gaap_StandardProductWarrantyAccrualPayments	(2,863)us-gaap_StandardProductWarrantyAccrualPayments
Balance at the end of the period	$ 217us-gaap_StandardProductWarrantyAccrual	$ 617us-gaap_StandardProductWarrantyAccrual	$ 1,329us-gaap_StandardProductWarrantyAccrual

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- Definition

Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(1),(c)(5)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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- Definition

Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(2))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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- Definition

Represents the minimum term of limited warranty services provided by the entity.

+ References

No definition available.

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- Definition

Represents the increase (decrease) in the liability for accruals related to standard product warranties issued during the period (benefit from expirations), net.

+ References

No definition available.

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- Definition

Represents the aggregate decrease in the liability due to derecognition of warranty reserve.

+ References

No definition available.

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Represents the maximum term of standard warranties from the time of final acceptance.

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No definition available.

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Represents the minimum term of standard warranties from the time of final acceptance.

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