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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS (Equity Method Investments - Narrative) (Details) (USD $) | 12 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2010 | Jun. 30, 2011
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |
Gain (loss) recognized on initial investment | $ (2,788,000)us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal | [1] |  | [1] |  | [1] |  |
ACELAND [Member] |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |
Payments to acquire interest in joint venture |  |  |  |  |  |  | 2,100,000 us-gaap_PaymentsToAcquireInterestInJointVenture / invest_InvestmentIssuerAxis = utsi_AcelandMember |
Contribution of equity investment through a shareholder loan |  |  |  |  |  |  |  | $ 7,100,000 us-gaap_PaymentsForAdvanceToAffiliate / invest_InvestmentIssuerAxis = utsi_AcelandMember
Equity method investment, ownership interest (as a percent) | 35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / invest_InvestmentIssuerAxis = utsi_AcelandMember |  |  |  |  |  |  |
ACELAND [Member] | Wireless City Planning [Member] |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership interest (as a percent) | 5.82%us-gaap_EquityMethodInvestmentOwnershipPercentage / invest_InvestmentIssuerAxis = utsi_AcelandMember / dei_LegalEntityAxis = utsi_WirelessCityPlanningMember |  |  |  |  |  |  |
[1] | The Company signed the loan agreement to for a total amount of $5.6 million in the fourth quarter of 2012, $4.0 million was drawdown in the fourth quarter of 2012 and the remaining in the first quarter of 2013. The loan bears interest at 20% per annum and originally matured on December 31, 2013, with subsequently extended the maturity date on 50% of the loan, or $2.8 million, to June 30, 2014, and the other half extended to December 31, 2014. In the fourth quarter of 2014, the Company received $0.8 million. The Company has performed an assessment on the need for a valuation reserve and $2.8 million was charged as impairment in other expenses in 2014 as the collection term was due. The management expects to collect the remaining $2.0 million balance in the second quarter of 2015.

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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