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Redeemable Convertible Preferred Stock - Narrative (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Jan. 31, 2020
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
shares
Temporary Equity [Line Items]            
Redeemable convertible preferred stock, outstanding (in shares)     0 153,937,730 153,938,000 142,662,000
Number of shares issued in conversion (in shares) 1   1      
Conversion of convertible securities (in shares) | $ $ 5,600,000,000   $ 5,541,758,000      
Redeemable convertible preferred stock, authorized (in shares)     0 154,055,430    
Liquidation Preference | $     $ 0 $ 326,559,000    
Stock-based compensation expense | $       43,280,000 $ 273,000  
Secondary transaction            
Temporary Equity [Line Items]            
Amount paid by investor to acquire shares | $   $ 25,500,000        
Fair value of shares | $   14,700,000        
Stock-based compensation expense | $       $ 43,200,000    
Secondary transaction | General and administrative            
Temporary Equity [Line Items]            
Stock-based compensation expense | $   $ 10,800,000        
Series A            
Temporary Equity [Line Items]            
Redeemable convertible preferred stock, outstanding (in shares)       21,311,000    
Redeemable convertible preferred stock, authorized (in shares)       21,428,000    
Liquidation Preference | $       $ 1,059,000    
Series A | Secondary transaction            
Temporary Equity [Line Items]            
Number of shares issued and sold (in shares)   26,210        
Series B            
Temporary Equity [Line Items]            
Redeemable convertible preferred stock, outstanding (in shares)       36,229,000    
Redeemable convertible preferred stock, authorized (in shares)       36,229,000    
Liquidation Preference | $       $ 5,000,000    
Series B | Secondary transaction            
Temporary Equity [Line Items]            
Number of shares issued and sold (in shares)   1,314,830        
Series C            
Temporary Equity [Line Items]            
Redeemable convertible preferred stock, outstanding (in shares)       15,307,000    
Redeemable convertible preferred stock, authorized (in shares)       15,307,000    
Liquidation Preference | $       $ 7,000,000    
Series C | Secondary transaction            
Temporary Equity [Line Items]            
Number of shares issued and sold (in shares)   448,110