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Acquisition - Additional Information (Details) - USD ($)
3 Months Ended
Dec. 09, 2019
Mar. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Senior credit facility, net of debt discount   $ 2,477,000 $ 2,437,000
Increase in goodwill   100,000  
Goodwill   11,500,000 11,400,000
Identifiable acquired assets   9,000,000  
Maximum      
Business Acquisition [Line Items]      
Increase in goodwill   100,000  
Increase in asset retirement obligation   100,000  
Senior Credit Facility      
Business Acquisition [Line Items]      
Business combination funded through additional borrowings   71,789,000 $ 72,527,000
SG Broadcasting | Senior Credit Facility      
Business Acquisition [Line Items]      
Senior credit facility, net of debt discount   2,500,000  
FMG Valdosta, LLC and FMG Kentucky, LLC | SG Broadcasting      
Business Acquisition [Line Items]      
Business combination purchase price $ 43,100,000 43,002,000  
Goodwill   $ 11,468,000  
FMG Valdosta, LLC and FMG Kentucky, LLC | SG Broadcasting | Series A Convertible Preferred Stock      
Business Acquisition [Line Items]      
Business combination equity issued 22,000,000    
FMG Valdosta, LLC and FMG Kentucky, LLC | SG Broadcasting | Senior Credit Facility      
Business Acquisition [Line Items]      
Business combination funded through additional borrowings 23,400,000    
Senior credit facility, net of debt discount 800,000    
Net proceeds from senior credit facility $ 22,600,000