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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranty - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2020
Minimum |
Product Warranty |
Warranty period | 1 year
Period after sale to provide limited warranty services | 2 years
Maximum |
Product Warranty |
Warranty period | 2 years

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ProductWarrantyLiabilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represent the period after the sale that the entity provides limited warranty services. + References No definition available. + Details
Name: | utsi_PeriodAfterSalesStandardProductWarrantyLimitedServices
Namespace Prefix: | utsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period of standard product warranty. + References No definition available. + Details
Name: | utsi_StandardProductWarrantyPeriod
Namespace Prefix: | utsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |