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BASIS OF PRESENTATION AND LIQUIDITY (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended	0 Months Ended	1 Months Ended	24 Months Ended
	Dec. 31, 2012 Minimum	Dec. 08, 2010 Hangzhou facility	Dec. 31, 2009 Hangzhou facility	Dec. 31, 2011 Hangzhou facility
Sale Leaseback Agreement
Proceeds from third party			$ 138.8
Advance notice period for termination of all or part of leaseback		6 months
Early termination penalties				$ 9.8
Period for which the entity's China and non-China operations will have sufficient liquidity to finance working capital and capital expenditure needs as per management estimate	12 months

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- Details

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

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- Definition

The gross proceeds received from the asset(s) sold in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller less the costs incurred in connection with the transaction, such as closing and deferred financing costs.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 98

-Section Appendix A

-Paragraph 28, 29

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 33

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 52

-URI http://asc.fasb.org/extlink&oid=9155692&loc=d3e51843-112757



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=9155692&loc=d3e51831-112757



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 51

-URI http://asc.fasb.org/extlink&oid=9155692&loc=d3e51840-112757

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Represent the period for which liquidity requirement to finance working capital and capital expenditure needs can be fulfilled.

+ References

No definition available.

+ Details

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Namespace Prefix:	utsi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the advance notice period for termination of the lease pursuant to the terms of the sale leaseback agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	utsi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Definition

Represents the early termination penalties paid on termination of leaseback transaction.

+ References

No definition available.

+ Details

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