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Stock-based Compensation - Stock-Based Compensation Expense Related to Stock Options (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense $ 705 $ 707
Research and development    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense 195 374
Selling, general and administrative    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense $ 510 $ 333