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BALANCE SHEET DETAILS - Schedule of Inventories (Parenthetical) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Balance Sheet Related Disclosures [Abstract] |  |
Finished goods at customer sites |  | $ 0.1

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

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- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date, of merchandise or goods at customer sites for which the customer has taken possession, but based on contractual terms, title has not yet passed to the customer. + References No definition available. + Details
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Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant