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Stockholders' Equity (Deficit) - Additional Information (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2021
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Jul. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
Vote
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2014
$ / shares
shares
Jun. 24, 2021
shares
Class Of Stock [Line Items]                
Preferred Stock, Shares Authorized       10,000,000 0      
Preferred Stock, Par or Stated Value Per Share | $ / shares       $ 0.00001 $ 0.00001      
Common Stock, Shares Authorized       0 323,000,000      
Conversion, percent threshold       10.00%        
Redeemable Convertible Preferred Stock, Shares Outstanding       0 115,277,850      
Redeemable Convertible Preferred Stock, Shares Issued       0 115,277,850      
Common stock charitable donation expense | $       $ 13,290 $ 0 $ 0    
Common Stock, Par Value | $ / shares       $ 0.00001 $ 0.00001      
Common stock reserved for issuance (in shares)       106,320,711 191,849,299      
Intrinsic value of options exercised | $       $ 976,500 $ 60,800 $ 16,300    
Weighted average grant date fair value per share of options granted | $ / shares       $ 12.43 $ 4.43 $ 1.80    
Grant-date fair value of stock options vested | $       $ 63,600 $ 29,200 $ 15,400    
Shares early exercised and repurchase       2,164,577 2,338,945      
Liabilities for early exercise of unvested stock options and other liabilities | $       $ 15,800 $ 6,900      
Stock based compensation expense | $       155,624 $ 143,341 $ 18,617    
Cumulative stock-based compensation expense | $       $ 3,800        
Expected dividend yield       0.00% 0.00% 0.00%    
Unrecognized stock-based compensation expense | $       $ 518,700        
Unrecognized stock-based compensation expense, weighted-average period       3 years 2 months 12 days        
Common Stock [Member]                
Class Of Stock [Line Items]                
Common stock shares issued to founders             71,280,000  
Stock received after stock split             23,760,000  
Tender Offer [Member]                
Class Of Stock [Line Items]                
Stock based compensation expense | $         $ 76,300      
Shares issued, price per share | $ / shares     $ 14.9687          
Aggregate purchase price of stock issued | $     $ 137,200          
Tender Offer [Member] | Common Stock [Member]                
Class Of Stock [Line Items]                
Number of shares sold in transaction     1,883,233          
Secondary Sales [Member]                
Class Of Stock [Line Items]                
Stock based compensation expense | $         $ 35,600      
Secondary Sales [Member] | Director [Member]                
Class Of Stock [Line Items]                
Number of shares sold in transaction   2,632,747            
Shares issued, price per share | $ / shares   $ 14.9687            
Aggregate purchase price of stock issued | $   $ 39,400            
Secondary Sales [Member] | Director And Employee [Member]                
Class Of Stock [Line Items]                
Number of shares sold in transaction   2,142,900            
Shares issued, price per share | $ / shares   $ 14.00            
Aggregate purchase price of stock issued | $   $ 30,000            
Convertible Founder Stock [Member]                
Class Of Stock [Line Items]                
Convertible Founder Stock, Shares Outstanding       0 635,818     635,818
Convertible Founder Stock, Shares Issued       0 635,818   7,920,000  
Stock received after stock split             2,640,000  
Convertible founder stock (in shares)     7,284,182   (7,284,182)      
Common Stock, Par Value | $ / shares             $ 0.00001  
Convertible Founder Stock [Member] | Tender Offer [Member]                
Class Of Stock [Line Items]                
Convertible founder stock (in shares)     7,284,182          
Common Class A [Member]                
Class Of Stock [Line Items]                
Common Stock, Shares Authorized       1,000,000,000 0      
Common stock, voting rights, votes per share | Vote       1        
Number of new stock issued during the period 250,000              
Common stock charitable donation expense | $       $ 13,290        
Common Stock, Par Value | $ / shares       $ 0.00001 $ 0.00001      
Common Class B [Member]                
Class Of Stock [Line Items]                
Common Stock, Shares Authorized       500,000,000 0      
Common stock, voting rights, votes per share | Vote       10        
Common Stock, Par Value | $ / shares       $ 0.00001 $ 0.00001      
Convertible preferred stock, shares issued upon conversion       115,277,850        
Series E Preferred Stock                
Class Of Stock [Line Items]                
Redeemable Convertible Preferred Stock, Shares Outstanding         24,653,759      
Redeemable Convertible Preferred Stock, Shares Issued         24,653,759      
Convertible founder stock (in shares)         7,284,182      
Series E Redeemable Convertible Preferred Stock [Member] | Tender Offer [Member]                
Class Of Stock [Line Items]                
Convertible founder stock (in shares)     7,284,182          
2021 Plan [Member] | Common Class A [Member]                
Class Of Stock [Line Items]                
Common stock reserved for issuance (in shares)       25,812,876        
2021 Employee Stock Purchase Plan [Member]                
Class Of Stock [Line Items]                
Common stock reserved for issuance (in shares)       5,162,575 0      
Expected dividend yield       0.00%        
2021 Employee Stock Purchase Plan [Member] | Common Class A [Member]                
Class Of Stock [Line Items]                
Common stock reserved for issuance (in shares)       5,162,575        
Purchase price of common stock expressed as a percentage of its fair value       85.00%        
Performance Based Vesting Condition [Member]                
Class Of Stock [Line Items]                
Performance options, shares       2,875,255 2,875,255      
Service Based Vesting Condition [Member]                
Class Of Stock [Line Items]                
Performance options, shares       2,875,255 2,875,255      
Restricted Stock Units (RSUs) [Member]                
Class Of Stock [Line Items]                
Requisite period of common stock       4 years        
Total grant-date fair value of RSUs vested | $       $ 22,200        
Service based vesting period       4 years        
Stock based compensation expense | $       $ 6,800