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Summary of Significant Accounting Policies - Additional Information (Details)	Mar. 31, 2021 USD ($) RadioStation Structure	Dec. 31, 2020 USD ($)
Significant Accounting Policies [Line Items]
Number of radio stations | RadioStation	2
Number of advertising structures | Structure	3,500
Deferred tax assets valuation allowance	$ 18,800,000
COVID-19
Significant Accounting Policies [Line Items]
Deferred tax assets valuation allowance		$ 18,800,000
Fair Value Measurements Recurring | Level 3
Significant Accounting Policies [Line Items]
Assets	0
Liabilities	$ 0

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Significant accounting policies.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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-Name Accounting Standards Codification
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Fair value of financial and nonfinancial obligations.

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-Topic 820
-SubTopic 10
-Section 50
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