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Stock-Based Compensation - Summary of Compensation Expense Relating to Stock Options (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Excess tax benefits from stock option activity or stock-based compensation expense recognized in cash flows from operations     $ 0 $ 0
Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense $ 3,702 $ 3,030 7,649 5,634
Options [Member] | Research and Development [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense 1,744 1,805 3,661 3,395
Options [Member] | General and Administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense 1,958 1,225 3,988 2,239
Restricted Stock Units [Member] | Research and Development [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense 198 98 365 665
Restricted Stock Units [Member] | General and Administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense 517 206 1,969 1,027
Restricted Stock Units [Member] | Director [Member] | General and Administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense $ 238 $ 142 $ 377 $ 281