Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plans - Summary of Activities and Reconciliation of Common Stock Remaining for Grant (Detail)

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Equity Incentive Plans - Summary of Activities and Reconciliation of Common Stock Remaining for Grant (Detail) - shares
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Options granted (548,375)   (548,375)  
2020 and 2021 Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares authorized under 2020 and 2021 Plans   5,636,000   4,101,545
Restricted stock awards granted       (832,983)
Remaining shares available for grant   4,728,508   2,064,221
2021 Stock Option and Incentive Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Options granted   (907,492)   (1,204,341)