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Stockholders' Equity - Stock-based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Total stock-based compensation expenses $ 1,243 $ 822 $ 3,835 $ 2,671
General and Administrative Expense [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Total stock-based compensation expenses 705 526 2,175 1,596
Research and Development Expense [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Total stock-based compensation expenses $ 538 $ 296 $ 1,660 $ 1,075