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BALANCE SHEET DETAILS (Schedule of Prepaid and Other Current Assets) (Details) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2013 | Aug. 31, 2014 | Jul. 31, 2014
Prepaids and other current assets |  |  |  |  |  |  |  |  |
Prepaid tax | $ 4,323,000 us-gaap_PrepaidTaxes |  | $ 4,323,000 us-gaap_PrepaidTaxes |  |  | $ 4,894,000 us-gaap_PrepaidTaxes |  |  |
Advance to suppliers | 1,944,000 us-gaap_AdvancesOnInventoryPurchases |  | 1,944,000 us-gaap_AdvancesOnInventoryPurchases |  |  | 223,000 us-gaap_AdvancesOnInventoryPurchases |  |  |
Deferred taxes-current | 3,668,000 us-gaap_DeferredTaxAssetsNetCurrent |  | 3,668,000 us-gaap_DeferredTaxAssetsNetCurrent |  |  | 3,534,000 us-gaap_DeferredTaxAssetsNetCurrent |  |  |
Other receivable | 4,413,000 us-gaap_OtherAssetsCurrent | [1] | 4,413,000 us-gaap_OtherAssetsCurrent | [1] |  | 8,579,000 us-gaap_OtherAssetsCurrent | [1] |  |
Prepaid others | 4,989,000 us-gaap_OtherPrepaidExpenseCurrent |  | 4,989,000 us-gaap_OtherPrepaidExpenseCurrent |  |  | 4,322,000 us-gaap_OtherPrepaidExpenseCurrent |  |  |
Total Prepaids and other current assets | 19,337,000 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  | 19,337,000 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  |  | 21,552,000 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  |  |
Other receivables [Line Items] |  |  |  |  |  |  |  |  |
Amount of other receivable expects to be collected | 2,000,000 utsi_AmountOfOtherReceivableExpectsToBeCollected |  |  |  |  |  |  |  |
ESA Cultural Investment (Hong Kong) limited [Member] |  |  |  |  |  |  |  |  |
Other receivables [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from loan payments | 2,000,000 us-gaap_ProceedsFromCollectionOfLoansReceivable / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  | 800,000 us-gaap_ProceedsFromCollectionOfLoansReceivable / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  |  | 5,600,000 us-gaap_ProceedsFromCollectionOfLoansReceivable / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  |  |
Loan amount reseved due to collectability risk | 2,800,000 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  | 2,800,000 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  |  |  |  |  |
Loan receivable |  |  |  |  | 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 |  |  |  |
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 |  |  |  |  |  |
Interest rate of debt securities (as a percent) | 20.00%invest_InvestmentInterestRate / us-gaap_CounterpartyNameAxis = utsi_ESaCulturalInvestmentMember |  |  |  |  |  |  |  |
UiTV Media Inc [Member] |  |  |  |  |  |  |  |  |
Other receivables [Line Items] |  |  |  |  |  |  |  |  |
Amount paid to equity method investee |  |  |  |  |  |  |  | $ 1,800,000 utsi_PaymentsToEquityMethodInvestee / us-gaap_CounterpartyNameAxis = utsi_UiTVMediaIncMember | $ 1,080,000 utsi_PaymentsToEquityMethodInvestee / us-gaap_CounterpartyNameAxis = utsi_UiTVMediaIncMember
[1] | The other receivable balance includes loans of approximately $2.0 million and $5.6 million as of December 31, 2014 and December 31, 2013, respectively, made to ESA Cultural Investment (Hong Kong) limited (“borrower” or ESA), a movie investment company with its operations located in Beijing. The Company signed the loan agreement for a total amount of $5.6 million in the fourth quarter of 2012, and $4.0 million was drawdown in the fourth quarter of 2012 with the remaining in the first quarter of 2013. The loan bears interest at 20% per annum and originally matured on December 31, 2013, with a subsequently extended 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 against the principal of the outstanding entrusted loan amount. The Company has performed an assessment on the need for a valuation reserve due to collectability risk and $2.8 million was reserved as of December 31, 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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