Quarterly report pursuant to Section 13 or 15(d)

Stock Plans and Stock-Based Compensation - Additional Information (Detail)

v3.21.2
Stock Plans and Stock-Based Compensation - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Jan. 01, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of option granted to employees 133,124 2,479,340    
2020 New Hire Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant 750,000 750,000    
2013 Equity Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant 1,684,340 1,684,340    
Share reserved for issue       2,757,843
Maximum [Member] | 2013 Equity Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Incentive awards vested percentage     5.00%  
Minimum [Member] | 2013 Equity Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Incentive awards vested percentage     4.00%