Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Details)

v3.21.2
Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Aug. 10, 2021
May 31, 2019
Nov. 30, 2016
Aug. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Exercise price per share   $ 0.20          
Restricted Stock Units (RSUs) [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Contractual term of the grants upon issuance     10 years        
Share-based compensation arrangement award vesting period         6 years    
Unvested Former Parent Rsu [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Repurchase price per share         $ 0.006 $ 0.006  
Other Stock Based Awards [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of shares to be repurchased         2,106,729 2,359,536  
Repurchase price per share         $ 0.029 $ 0.029  
Shares Available Granted             3,370,766
Early exercised stock option liabilities         $ 0.1    
2016 Stock Option and Grant Plan [Member] | Incentive Stock Options [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Contractual term of options         10 years    
Award cliff off period         1 year    
Share-based compensation arrangement award vesting period         6 years    
2016 Stock Option and Grant Plan [Member] | Share-based Payment Arrangement, Nonemployee [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Options canceled and forfeited   8,422,017          
2016 Stock Option and Grant Plan [Member] | Grantee Owns Ten Percent of Voting Rights [Member] | Incentive Stock Options [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Contractual term of options         5 years    
Percentage of shareholding by grantee         10.00%    
Purchase price of common stock expressed as a percentage of its fair value     110.00%        
Percentage of stockholders to exercise price of option granted     10.00%        
Former Parent Plan [Member] | Share-based Payment Arrangement [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of shares to be repurchased         343,604 2,104,350  
Repurchase price per share         $ 0.006 $ 0.006  
Former Parent Plan [Member] | Unvested Former Parent Rsu [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of shares to be repurchased         0 0  
2021 Equity Incentive Plan [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Shares, available for grant         66,535,304    
Percentage Of Share Outstanding       (4.00%)      
2021 Employee Stock Purchase Plan [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Purchase price of common stock expressed as a percentage of its fair value 85.00%            
Shares, available for grant         6,653,530    
Share-based Compensation Arrangement by Share-based Payment Award, Description a number of shares of common stock equal to half percent (0.5%) of the total number of shares of all classes of common stock of the Company on the last day of the immediately preceding fiscal yea