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Stock-based Compensation - Stock-Based Compensation Expense Related to Stock Options (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation expense $ 759 $ 728 $ 1,464 $ 1,435
Research and development        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation expense 216 301 411 675
Selling, general and administrative        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation expense $ 543 $ 427 $ 1,053 $ 760