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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Jan. 01, 2021
Jul. 02, 2020
Jul. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Reserved shares of common stock for issuance       14,015,353 11,279,849
Weighted average grant-date fair value of stock options granted       $ 32.39  
Common stock, par value       $ 0.0001 $ 0.0001
Restricted Common Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Awards forfeited or cancelled       7,000  
Number of shares granted       635,613  
Unrecognized stock-based compensation cost       $ 34.8  
Weighted average period of cost expected to be recognized       3 years 6 months 10 days  
Stock Options          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Weighted average period of cost expected to be recognized       3 years 6 months  
Unrecognized stock-based compensation expenses       $ 80.3  
2018 Equity Incentive Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Awards vesting period       4 years  
Awards contractual term       10 years  
Common stock shares granted       6,715,415  
Number of shares of common stock issuable upon exercise of outstanding options       98,643  
Awards forfeited or cancelled       0  
Reserved shares of common stock for issuance       0  
2020 Stock Option and Grant Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Awards vesting period   4 years      
Awards contractual term   10 years      
Reserved shares of common stock for issuance       5,350,553  
Common stock authorized for issuance   8,008,734      
Cumulative increase in number shares reserved for issuance, percentage   5.00%      
Shares added to number of available shares under plan 3,255,343        
Common stock issuable upon exercise of outstanding options       5,085,404  
2020 Stock Option and Grant Plan | Restricted Common Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares granted       886,620  
2020 ESPP          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Reserved shares of common stock for issuance     611,354    
Cumulative increase in number shares reserved for issuance, percentage     1.00%    
Common stock, par value     $ 0.0001    
Annual increase in number of shares reserved for issuance     1,222,707