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BALANCE SHEET DETAILS - Schedule of Prepaid and Other Current Assets (Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Prepaid consumption tax	$ 100	$ 100
Prepaid of value added tax	200	900
Duty recoverable		10
Prepaid goods and service tax	300	300
Interest receivable	$ 2,100	$ 2,000

X

- References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Carrying amount as of the balance sheet date of value added taxes due either from customers arising from sales on credit terms, or as previously overpaid to tax authorities. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Name:	us-gaap_ValueAddedTaxReceivableCurrent
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- Definition

Duty recoverable current.

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No definition available.

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Name:	utsi_DutyRecoverableCurrent
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- Definition

Prepaid consumption tax current.

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No definition available.

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- Definition

Prepaid goods and service tax current.

+ References

No definition available.

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Name:	utsi_PrepaidGoodsAndServiceTaxCurrent
Namespace Prefix:	utsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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