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Stock-Based Compensation - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Jan. 01, 2022
2018 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of shares issued on common stock outstanding 4.00%    
Number of shares available for future grant 997,841   1,318,271
Stock option expiration period 10 years    
2018 Plan | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise price per share of stock options as percentage of fair market value of common stock 100.00%    
Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock- based compensation expense $ 2,493,000 $ 3,118,000  
Plans | Options to Purchase Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares, Granted 1,672,250 2,097,256  
Stock- based compensation expense $ 2,491,000 $ 2,812,000  
Weighted-average grant-date fair values of options granted $ 0.44 $ 4.13  
Unrecognized compensation cost, recognized cost 2 years 3 months 18 days    
Unrecognized compensation cost $ 6,019,000    
Option outstanding 5,390,188    
Plans | Unvested Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option outstanding 2,931,063    
Plans | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock- based compensation expense $ 0 $ 132,000  
Restricted stock, granted 0 0  
Stock options outstanding, unvested 0    
Plans | Restricted Stock Unit [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock- based compensation expense $ 2,000 $ 174,000  
Restricted stock, granted 0 5,939  
Stock options outstanding, unvested 0    
Plans | Maximum [Member] | Non Statutory Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option vesting period 4 years    
Plans | Minimum [Member] | Non Statutory Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option vesting period 1 year