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Related-Party Transactions (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 28, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]            
Payments on consideration payable       $ 5,448,000 $ 2,321,000 $ 814,000
Underwriting fee, percent of stock issuance costs       4.50%    
Sale of stock, aggregate issuance amount $ 84,000,000          
Professional service fees paid by shareholder       $ 0 2,891,000 0
Public Stock Offering            
Related Party Transaction [Line Items]            
Sale of common stock, shares issued (in shares) 8,000,000          
Raine Group            
Related Party Transaction [Line Items]            
Payments for underwriting expense       $ 200,000    
Underwriting fee, percent paid       5.50%    
Consideration Payable to Previous Sellers in Business Acquisitions | Fair Share Seller | Director            
Related Party Transaction [Line Items]            
Contingent consideration liability   $ 2,000,000.0   $ 1,600,000 2,000,000.0  
Payments on consideration payable       900,000 900,000 0
Consideration Payable to Previous Sellers in Business Acquisitions | G3 Seller | Employee            
Related Party Transaction [Line Items]            
Contingent consideration liability   3,100,000   500,000 3,100,000  
Payments on consideration payable       2,500,000 400,000 0
Consideration Payable to Previous Sellers in Business Acquisitions | Tom's Amusements | Employee            
Related Party Transaction [Line Items]            
Payments on consideration payable       1,500,000 0  
Legal Fees for General Legal and Business Matters | Much Shelist | Affiliated Entity            
Related Party Transaction [Line Items]            
Legal fees       $ 100,000 600,000 $ 300,000
Legal Fees for General Legal and Business Matters | Additional Paid-In Capital | Much Shelist | Affiliated Entity            
Related Party Transaction [Line Items]            
Net equity infusion from reverse recapitalization   $ 200,000        
Investment Banking Services and Assistance with Reverse Recapitalization | The Raine Group | Affiliated Entity            
Related Party Transaction [Line Items]            
Payments to related party         $ 11,000,000  
Payments for Public Accounting Firm Services Rendered on Behalf of the Company | Class A Common Stockholder            
Related Party Transaction [Line Items]            
Professional service fees paid by shareholder     $ 2,900,000