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Long-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Aug. 28, 2020
Debt Instrument [Line Items]      
Principal amount outstanding $ 97,907,000    
Credit facility, debt discount 2,006,000 $ 2,153,000  
Senior credit facility amount $ 0    
Debt instrument interest percentage 6.00%    
Debt instrument increasing interest rate of each successive anniversary 1.00%    
SG Broadcasting      
Debt Instrument [Line Items]      
Principal amount outstanding $ 21,400,000    
Emmis      
Debt Instrument [Line Items]      
Principal amount outstanding 5,535,000    
Convertible Promissory Note | Emmis | SG Broadcasting      
Debt Instrument [Line Items]      
Principal amount outstanding 5,500,000    
Senior credit facility amount $ 0    
Debt instrument interest percentage 6.00%    
Additional payment of interest in kind 1.00%    
Debt instrument increasing interest rate of second anniversary 1.00%    
Debt instrument increasing interest rate of each successive anniversary 1.00%    
Debt instrument maturity date Nov. 25, 2024    
Second Amended and Restated SG Broadcasting Promissory Note | SG Broadcasting      
Debt Instrument [Line Items]      
Senior credit facility amount $ 0    
Debt instrument interest percentage 6.00%    
Debt instrument increasing interest rate of second anniversary 1.00%    
Debt instrument increasing interest rate of each successive anniversary 1.00%    
Debt instrument maturity date May 25, 2025    
Additional SG Broadcasting Promissory Note | SG Broadcasting      
Debt Instrument [Line Items]      
Senior credit facility amount $ 0    
Debt instrument interest percentage 6.00%    
Debt instrument increasing interest rate of second anniversary 1.00%    
Debt instrument increasing interest rate of each successive anniversary 1.00%    
Debt instrument maturity date Mar. 30, 2025    
Promissory Note | SG Broadcasting      
Debt Instrument [Line Items]      
Principal amount outstanding $ 21,400,000   $ 20,000,000
Senior Credit Facility      
Debt Instrument [Line Items]      
Principal amount outstanding 70,972,000    
Credit facility, debt discount $ 2,000,000    
Senior Credit Facility | FCC Licenses      
Debt Instrument [Line Items]      
Formula based percentage on fair value of licenses 60.00%    
GACP Finance Co., LLC | Senior Credit Facility      
Debt Instrument [Line Items]      
Debt instrument, term 5 years    
Credit facility, payment terms the Senior Credit Facility required interest payments on the first business day of each calendar month, and quarterly payments on the principal in an amount equal to one and one quarter percent of the initial aggregate principal amount were due on the last day of each calendar quarter.    
Percentage of fixed charge coverage ratio 110.00%    
Minimum liquidity amount, year two $ 2,500    
Minimum liquidity amount, thereafter $ 3,000    
LIBOR | GACP Finance Co., LLC | Senior Credit Facility      
Debt Instrument [Line Items]      
Interest rate of borrowing 7.50%    
LIBOR Floor | GACP Finance Co., LLC | Senior Credit Facility      
Debt Instrument [Line Items]      
Interest rate of borrowing 2.00%