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Stockholders' Equity - Common Stock Shares (Details) - $ / shares
4 Months Ended 9 Months Ended
Dec. 31, 2020
Sep. 30, 2021
Jan. 14, 2021
Jan. 11, 2021
Oct. 31, 2020
Sep. 30, 2020
Sep. 09, 2020
Dec. 31, 2019
Class A Common Stock                
Class of Stock [Line Items]                
Common shares, shares authorized (in shares) 500,000,000 500,000,000           500,000,000
Common shares, par value (in dollars per share) $ 0.0001 $ 0.0001           $ 0.0001
Common shares, shares issued (in shares) 5,034,459 12,803,162           5,014,300
Common shares, shares outstanding (in shares) 5,034,459 5,081,771           5,014,300
Class A Common Stock | 890 5TH AVENUE PARTNERS, INC.                
Class of Stock [Line Items]                
Common shares, shares authorized (in shares) 500,000,000 500,000,000   500,000,000     0  
Common shares, par value (in dollars per share) $ 0.0001 $ 0.0001   $ 0.0001        
Common shares, shares issued (in shares) 0 777,500            
Common shares, shares outstanding (in shares) 0 777,500            
Temporary equity, shares outstanding   28,750,000            
Class A Common Stock Subject to Redemption | 890 5TH AVENUE PARTNERS, INC.                
Class of Stock [Line Items]                
Common shares, par value (in dollars per share) $ 0.0001 $ 0.0001            
Temporary equity, shares outstanding 0 28,750,000            
Class A Common Stock Not Subject to Redemption | 890 5TH AVENUE PARTNERS, INC.                
Class of Stock [Line Items]                
Common shares, shares authorized (in shares) 500,000,000         500,000,000    
Common shares, par value (in dollars per share) $ 0.0001         $ 0.0001    
Common shares, shares issued (in shares) 0         0    
Common shares, shares outstanding (in shares) 0         0    
Class B Common Stock                
Class of Stock [Line Items]                
Common shares, shares authorized (in shares) 500,000,000 500,000,000           500,000,000
Common shares, par value (in dollars per share) $ 0.0001 $ 0.0001           $ 0.0001
Common shares, shares issued (in shares) 34,362,554 27,391,338           34,152,328
Common shares, shares outstanding (in shares) 34,114,327 27,143,111           33,904,101
Class F Common Stock | 890 5TH AVENUE PARTNERS, INC.                
Class of Stock [Line Items]                
Common shares, shares authorized (in shares) 25,000,000 25,000,000            
Common shares, par value (in dollars per share) $ 0.0001 $ 0.0001            
Common shares, shares issued (in shares) 7,187,500 7,187,500     7,187,500      
Common shares, shares outstanding (in shares) 7,187,500 7,187,500            
Common stock shares subject to forfeiture         937,500      
Percentage of issued and outstanding shares after the Initial Public Offering collectively held by initial stockholders 20.00%              
Number of common stock issuable pursuant to Initial Business Combination, as a percent of outstanding shares 20.00% 20.00%            
Class F Common Stock | Over-allotment option | 890 5TH AVENUE PARTNERS, INC.                
Class of Stock [Line Items]                
Common stock shares subject to forfeiture     937,500