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Stock-Based Compensation - Summary of Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Stock-based compensation $ 9,486 $ 359 $ 28,092 $ 1,042 $ 3,847 $ 2,483
Research and Development [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Stock-based compensation 3,700 189 12,871 539 1,106 372
Selling, General and Administrative [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Stock-based compensation $ 5,786 $ 170 $ 15,221 $ 503 $ 2,741 $ 2,111