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Summary of Significant Accounting Policies - Schedule of Convertible Equity Shares Excluded from Calculation of Diluted Net Loss per Share (Details)
shares in Thousands
3 Months Ended
Mar. 31, 2021
shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]  
Shares excluded from calculation of diluted net loss per share 20,079
Convertible Promissory Note | Emmis  
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]  
Shares excluded from calculation of diluted net loss per share 2,126
Convertible Promissory Note | SG Broadcasting  
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]  
Shares excluded from calculation of diluted net loss per share 8,219
Series A Convertible Preferred Stock  
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]  
Shares excluded from calculation of diluted net loss per share 9,560
Restricted Stock Awards  
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]  
Shares excluded from calculation of diluted net loss per share 174