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Stock-Based Awards - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 11, 2020
Jun. 30, 2021
Jan. 31, 2021
Dec. 31, 2020
Jan. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock compensation on account of unvested options   $ 51.0        
Unrecognized stock compensation on account of unvested options remaining period over which the compensation is to be recognized   2 years 9 months 18 days        
Unvested Stock Awards for Which Performance is not Probable            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock compensation on account of unvested options   $ 1.9        
Service Based Options [Member] | Certain Employees Directors and Consultants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation by share based payment arrangement number of options granted   1,633,789        
Share based compensation by share based payment arrangement number of options granted weighted average exercise price per share   $ 20.05        
Period of vesting of employee stock options   4 years        
2020 Stock Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock reserved for future issuance 2,547,698          
Stock based compensation vesting period service based   4 years        
Stock based compensation period of expiry   10 years        
Common stock shares available for future issuance   3,069,610        
2020 Stock Incentive Plan | Maximum | Additional From 2017 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock reserved for future issuance 7,173,014          
2020 Stock Incentive Plan | Maximum | Annual Increase 2021 To 2030            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of common stock shares additionally reserved for issuance 4.00%          
Employee Stock Purchase Plan 2020            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock reserved for future issuance     950,931 481,231    
Common stock shares available for future issuance   935,420        
Issuance of common stock under other equity plans, shares   15,511        
Employee Stock Purchase Plan 2020 | Maximum | Annual Increase 2021 To 2030            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of common stock shares additionally reserved for issuance 1.00%          
Number of share instruments newly issued under a share-based compensation plan 1,302,157          
Common Stock [Member] | 2017 Stock Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation by share based payment arrangement number of shares authorized for issuance         10,275,717 8,407,405
Common Stock [Member] | 2020 Stock Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation by share based payment arrangement number of shares authorized for issuance     12,154,517 10,275,717