SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Launch support amortization expense (Details) $ in Thousands	Dec. 31, 2023 USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
2024	$ 4,980
2025	4,980
2026	3,409
2027	237
2028	68
Thereafter	$ 6

Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for launch assets.

No definition available.

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Amount of amortization expense expected to be recognized thereafter the fifth fiscal year following the latest fiscal year for launch assets.

No definition available.

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Period Type:	instant

Amount of amortization expense expected to be recognized during the five fiscal year following the latest fiscal year for launch assets.

No definition available.

Name:	uone_LaunchAssetsAmortizationExpenseYearFive
Namespace Prefix:	uone_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of amortization expense expected to be recognized during the four fiscal year following the latest fiscal year for launch assets.

No definition available.

Name:	uone_LaunchAssetsAmortizationExpenseYearFour
Namespace Prefix:	uone_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for launch assets.

No definition available.

Name:	uone_LaunchAssetsAmortizationExpenseYearThree
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for launch assets.

No definition available.

Name:	uone_LaunchAssetsAmortizationExpenseYearTwo
Namespace Prefix:	uone_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No definition available.

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