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Stock-Based Compensation - Schedule of Components and Classification of Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense $ 7,080 $ 7,245
Employee    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense 6,547 5,947
Non-employee    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense 533 1,298
Stock Options    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense 7,080 7,245
Research and Development    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense 3,563 3,845
General and Administrative    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense $ 3,517 $ 3,400