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BASIS OF PRESENTATION AND LIQUIDITY (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
BASIS OF PRESENTATION AND LIQUIDITY [Abstract] |  |  |  |
Net losses | $ (30,264)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (22,721)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (34,385)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Net cash outflows from operations | 15,612 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 1,915 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 25,618 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations |
Cash and cash equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 77,824 us-gaap_CashAndCashEquivalentsAtCarryingValue | 107,773 us-gaap_CashAndCashEquivalentsAtCarryingValue | 179,584 us-gaap_CashAndCashEquivalentsAtCarryingValue | 301,626 us-gaap_CashAndCashEquivalentsAtCarryingValue
Accumulated deficit | 1,206,286 us-gaap_RetainedEarningsAccumulatedDeficit | 1,176,022 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Subsidiaries [Member] | China [Member] |  |  |  |
Cash and cash equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 14,500 us-gaap_CashAndCashEquivalentsAtCarryingValue / utsi_AllCountriesAxis = country_CN / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 11,500 us-gaap_CashAndCashEquivalentsAtCarryingValue / utsi_AllCountriesAxis = country_CN / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Accumulated deficit | $ 0 us-gaap_RetainedEarningsAccumulatedDeficit / utsi_AllCountriesAxis = country_CN / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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