Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Stock-Based Compensation Expense Related to Stock Options (Detail)

v3.21.2
Stock-based Compensation - Stock-Based Compensation Expense Related to Stock Options (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 [Line Items]        
Stock-based compensation expense related to stock options $ 588 $ 399 $ 1,528 $ 1,220
Research and development        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation expense related to stock options 174 130 436 394
Selling, general and administrative        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation expense related to stock options $ 414 $ 269 $ 1,092 $ 826