Quarterly report pursuant to Section 13 or 15(d)

Supplemental Information - Summary of Certain Statements of Operations Amounts (Detail)

v3.21.2
Supplemental Information - Summary of Certain Statements of Operations Amounts (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense $ 1,236 $ 570 $ 865 $ 3,638
Research and Development [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense 252 (84) 1,061 723
Selling, General and Administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense $ 984 $ 654 $ (196) $ 2,915