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RELATED PARTY TRANSACTIONS - Convertible Promissory Notes (Details) - USD ($)
3 Months Ended 9 Months Ended
Aug. 19, 2022
Jul. 28, 2022
May 19, 2022
Nov. 25, 2021
Sep. 30, 2021
Nov. 25, 2020
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Jun. 01, 2021
May 19, 2021
Sep. 30, 2020
Aug. 28, 2020
Mar. 27, 2020
Feb. 28, 2020
Nov. 25, 2019
Related Party Transaction [Line Items]                                  
Principal amount outstanding             $ 72,861,000   $ 72,861,000                
Interest expense recognized             2,404,000 $ 2,895,000 8,185,000 $ 8,134,000              
Conversion of SG Broadcasting Promissory Notes To Common Stock                                  
Related Party Transaction [Line Items]                                  
Debt conversion, original debt, amount, principal   $ 28,000,000                              
Conversion of SG Broadcasting Promissory Notes To Common Stock | Class A Common Stock                                  
Related Party Transaction [Line Items]                                  
Debt conversion, common stock (in shares)   12,900,000                              
Convertible Emmis promissory note                                  
Related Party Transaction [Line Items]                                  
Debt conversion, original debt, amount, principal $ 30,000                                
Convertible Emmis promissory note | Class A Common Stock                                  
Related Party Transaction [Line Items]                                  
Debt conversion, common stock (in shares) 11,000                                
Second Amended Promissory Note                                  
Related Party Transaction [Line Items]                                  
Additional interest payments         $ 25,000                        
Convertible Emmis promissory note                                  
Related Party Transaction [Line Items]                                  
Principal amount outstanding             6,124,000   6,124,000                
Convertible Emmis promissory note | Convertible Promissory Notes                                  
Related Party Transaction [Line Items]                                  
Face amount of debt                                 $ 5,000,000
Principal amount outstanding             $ 6,100,000   6,100,000                
Additional interest payments       $ 600,000   $ 500,000                      
Interest expense recognized                 600,000 $ 500,000              
SG Broadcasting                                  
Related Party Transaction [Line Items]                                  
Additional interest payments     $ 400,000                            
SG Broadcasting | Convertible Promissory Notes                                  
Related Party Transaction [Line Items]                                  
Face amount of debt                                 6,300,000
Additional interest payments       $ 2,200,000   $ 1,100,000                      
Interest expense recognized                 $ 1,800,000                
SG Broadcasting | Convertible Promissory Notes | Maximum                                  
Related Party Transaction [Line Items]                                  
Face amount of debt                                 $ 6,300,000
Convertible Standard General promissory notes | Promissory Note                                  
Related Party Transaction [Line Items]                                  
Additional loan for working capital                         $ 300,000 $ 8,700,000 $ 3,000,000 $ 2,000,000  
Principal amount outstanding                           $ 20,000,000      
Convertible Standard General promissory notes | May 2021 SG Broadcasting Promissory Note                                  
Related Party Transaction [Line Items]                                  
Face amount of debt                     $ 1,000,000 $ 3,000,000          
Senior credit facility amount                       $ 7,000,000          
Convertible Standard General promissory notes | Maximum | Promissory Note                                  
Related Party Transaction [Line Items]                                  
Face amount of debt                             $ 20,000,000 $ 10,300,000