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OTHER INCOME (EXPENSES), NET (Schedule of Components of Other Income, Net) (Details) (USD $) | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 item | Dec. 31, 2013 item | Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2012 | Jun. 30, 2015
OTHER INCOME (EXPENSES), NET [Abstract] |  |  |  |  |  |  |  |  |
Foreign exchange (losses) gains | $ (586,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |  | $ 3,856,000 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |  | $ (4,675,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |  |  |  |
Gain (loss) from the currency translation adjustment | (121,000)utsi_ForeignCurrencyTranslationAdjustmentGainLossBeforeTax | [1] | 7,088,000 utsi_ForeignCurrencyTranslationAdjustmentGainLossBeforeTax | [1] |  | [1] |  |  |
Tax reversal for expiration of the statute of limitations | 992,000 us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions | [2] | 1,240,000 us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions | [2] | 1,499,000 us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions | [2] |  |  |
ESA loan impairment | (2,788,000)us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal | [3] |  | [3] |  | [3] |  |  |
Other | 254,000 utsi_OtherNonoperatingIncomeExpenseMiscellaneous |  | (704,000)utsi_OtherNonoperatingIncomeExpenseMiscellaneous |  | 203,000 utsi_OtherNonoperatingIncomeExpenseMiscellaneous |  |  |  |
Total | (2,249,000)us-gaap_OtherNonoperatingIncomeExpense |  | 11,480,000 us-gaap_OtherNonoperatingIncomeExpense |  | (2,973,000)us-gaap_OtherNonoperatingIncomeExpense |  |  |  |
Number of inactive Chinese entities | 3 utsi_NumberOfInactiveChineseEntities |  | 2 utsi_NumberOfInactiveChineseEntities |  |  |  | 3 utsi_NumberOfInactiveChineseEntities |  |
Period after the filing of the tax return when tax reserve was released |  |  |  |  | 5 years |  |  |  |
ESA Cultural Investment (Hong Kong) limited [Member] |  |  |  |  |  |  |  |  |
Other receivables [Line Items] |  |  |  |  |  |  |  |  |
Loan receivable |  |  |  |  | 5,600,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  |  | 5,600,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |
Amount drawn |  |  |  |  |  |  | 800,000 us-gaap_PaymentsForProceedsFromLoansReceivable / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember | 4,000,000 us-gaap_PaymentsForProceedsFromLoansReceivable / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |
Interest rate of debt securities (as a percent) | 20.00%invest_InvestmentInterestRate / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  |  |  |  |  |  |  |
Percentage of loan receivable on extended maturity date | 50.00%utsi_PercentageOfLoanGrossCarryingAmountOfExtendedMaturityDate / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  |  |  |  |  |  |  |
Loan receivable on extended maturity date | 2,800,000 utsi_LoansReceivableGrossCarryingAmountOfExtendedMaturityDate / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  |  |  |  |  | 2,800,000 utsi_LoansReceivableGrossCarryingAmountOfExtendedMaturityDate / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  |
Proceeds from loan payments | 2,000,000 us-gaap_ProceedsFromCollectionOfLoansReceivable / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  | 5,600,000 us-gaap_ProceedsFromCollectionOfLoansReceivable / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  |  |  | 800,000 us-gaap_ProceedsFromCollectionOfLoansReceivable / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  |
ESA Cultural Investment (Hong Kong) limited [Member] | Subsequent Events [Member] |  |  |  |  |  |  |  |  |
Other receivables [Line Items] |  |  |  |  |  |  |  |  |
Amount drawn |  |  |  |  |  |  |  |  | $ 2,000,000 us-gaap_PaymentsForProceedsFromLoansReceivable / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
[1] | During 2013, the Company recognized $7.1 million gain in the Consolidated Statements of Operations and Comprehensive Income (Loss) on the reversal of the cumulative translation adjustment previously recorded in accumulated other comprehensive income upon the liquidation of two previously inactive Chinese entities. The prior cumulative translation adjustment primarily resulted from the difference between local functional currency and the Company's reporting currency.
[2] | Previously, when the Company divested its Korean subsidiary, the Company provided a tax reserve as it offered indemnification to the buyer for the uncertain tax position arising in the periods before the divestiture. In April 2012, approximately $1.5 million of such tax reserve was released due to the expiration of the statute of limitations, which is five years after the filing of the tax return. In 2013, approximately $1.2 million of such tax reserve was released due to expiration of statute of limitations. In 2014, remaining amount of approximately $1.0 million of such tax reserve was released due to expiration of statute of limitations.
[3] | 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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