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Stock-based Compensation - Summary of Allocated Stock-based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Feb. 24, 2020
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense   $ 1,308 $ 3,995
Research and Development Expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense   241 219
General and Administrative Expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense   $ 1,067 1,652
Restructuring Charges [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense $ 2,100   $ 2,124