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Stockholders' Deficit - Additional Information (Details) - $ / shares
Sep. 30, 2021
Jun. 30, 2021
Mar. 26, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]                
Common stock authorized (in shares) 126,700,000     121,000,000     121,000,000  
Common stock, par value (in USD per share) $ 0.0001     $ 0.0001     $ 0.0001  
Common stock issued (in shares) 36,362,000     33,415,000     31,483,000  
Common stock outstanding (in shares) 36,362,000     33,415,000     31,483,000  
Common stock subject to possible redemption (in shares) 61,332,000 61,332,000   61,332,000 61,332,000 61,332,000 61,332,000 52,993,000
Khosla                
Class of Stock [Line Items]                
Preferred stock authorized (in shares) 1,000,000 1,000,000            
Preferred stock, par value (in USD per share) $ 0.0001 $ 0.0001            
Preferred stock issued (in shares) 0 0            
Preferred stock outstanding (in shares) 0 0            
Common stock subject to possible redemption (in shares) 41,634,412              
Khosla | Class A Common Stock                
Class of Stock [Line Items]                
Common stock authorized (in shares) 200,000,000 200,000,000            
Common stock, par value (in USD per share) $ 0.0001 $ 0.0001 $ 0.0001          
Common stock issued (in shares) 1,132,688 1,132,688            
Common stock outstanding (in shares) 1,132,688 1,132,688            
Common stock subject to possible redemption (in shares) 41,634,412 41,634,412            
Khosla | Class B Common Stock                
Class of Stock [Line Items]                
Common stock authorized (in shares) 30,000,000 30,000,000            
Common stock, par value (in USD per share) $ 0.0001 $ 0.0001            
Common stock issued (in shares) 5,000,000 5,000,000            
Common stock outstanding (in shares) 5,000,000 5,000,000