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Redeemable Convertible Preferred Stock and Stockholders’ Equity - Additional Information (Details)
 9 Months Ended
Mar. 28, 2021
shares
Mar. 15, 2021
Mar. 03, 2021
Dec. 19, 2019
Sep. 30, 2021
vote
$ / shares
shares
Dec. 31, 2020
vote
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Class of Stock [Line Items]              
Redeemable convertible preferred stock, authorized (in shares) 9,898,400            
Preferred stock, conversion ratio 3            
Conversion of preferred stock (in shares) 29,695,200            
Common stock, authorized (in shares)         0 300,000,000 300,000,000
Common stock, par value (in USD per share) | $ / shares         $ 0.00001 $ 0.00001 $ 0.00001
Preferred stock, authorized (in shares)         100,000,000 9,898,400 9,898,400
Preferred stock, par value (in USD per share) | $ / shares         $ 0.00001 $ 0.00001 $ 0.00001
Percentage of votes required     0.6666   0.6666    
Anniversary of effectiveness         7 years    
Percentage of outstanding shares         0.10    
Stock split, conversion ratio   3   100      
Series A redeemable convertible preferred stock              
Class of Stock [Line Items]              
Redeemable convertible preferred stock, authorized (in shares) 3,379,400       0 3,379,400  
Series A-1 redeemable convertible preferred stock              
Class of Stock [Line Items]              
Redeemable convertible preferred stock, authorized (in shares) 1,837,600       0 1,837,600 1,837,600
Series B convertible preferred stock              
Class of Stock [Line Items]              
Redeemable convertible preferred stock, authorized (in shares) 4,681,400            
Preferred stock, authorized (in shares)         0 4,681,400 4,681,400
Preferred stock, par value (in USD per share) | $ / shares         $ 0.00001 $ 0.00001 $ 0.00001
Common Class A              
Class of Stock [Line Items]              
Common stock, authorized (in shares)         1,000,000,000 0  
Common stock, par value (in USD per share) | $ / shares         $ 0.00001 $ 0.00001  
Number of votes per share of stock held | vote         1 1  
Number of shares issued in conversion (in shares)         1    
Common Class B              
Class of Stock [Line Items]              
Common stock, authorized (in shares)         160,000,000 0  
Common stock, par value (in USD per share) | $ / shares         $ 0.00001 $ 0.00001  
Number of votes per share of stock held | vote         10    
Number of shares issued in conversion (in shares)         1