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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Summary of the Total Potential Ordinary Shares that were Excluded from the Diluted Per Share Calculation) (Details) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Antidilutive securities excluded from computation of earnings per share [Line Items] |  |  |  |  |  |
Antidilutive securities (in shares) | 1,784 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | [1] | 1,734 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | [1] | 2,002 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | [1]
Anti-dilutive stock options and awards/units outstanding [Member] |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share [Line Items] |  |  |  |  |  |
Antidilutive securities (in shares) | 1,784 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = utsi_StockOptionsAndStockAwardsMember |  | 1,734 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = utsi_StockOptionsAndStockAwardsMember |  | 2,002 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = utsi_StockOptionsAndStockAwardsMember |
[1] | Calculated using the treasury stock method, which assumes proceeds are used to reduce the dilutive effect of outstanding stock awards. Assumed proceeds include the unrecognized deferred compensation of share awards, and assumed tax proceeds from excess stock-based compensation deductions.

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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