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OTHER INCOME (EXPENSE), NET - Schedule of Components of Other Income (expense), Net (Parenthetical) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other Income And Expenses [Abstract] |  |  |
Reversal of FIN 45 & FIN 48 due to expiration of statute of limitations | $ 1,182 | $ 2,462 | $ 1,409

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- References No definition available. + Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of reversal of tax provision. + References No definition available. + Details
Name: | utsi_TaxProvisionReversal
Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration