v3.25.3
Share-Based Compensation - Schedule of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Stock Option Shares    
Shares, Outstanding at beginning balance (in shares) 4,950,016  
Shares, Granted (in shares) 3,385,624  
Shares, Exercised (in shares) (24,936)  
Shares, Cancelled/Forfeited (in shares) (796,199)  
Shares, Outstanding at ending balance (in shares) 7,514,505 4,950,016
Shares, Options exercisable (in shares) 3,247,074  
Shares, Vested and expected (in shares) 7,514,505  
Weighted Average Exercise Price    
Weighted Average Exercise Price, Outstanding at beginning balance (in dollars per share) $ 10.82  
Weighted Average Exercise Price, Granted (in dollars per share) 1.85  
Weighted Average Exercise Price, Exercised (in dollars per share) 1.06  
Weighted Average Exercise Price, Cancelled/Forfeited (in dollars per share) 10.9  
Weighted Average Exercise Price, Outstanding at ending balance (in dollars per share) 6.8 $ 10.82
Weighted Average Exercise Price, Options exercisable (in dollars per share) 12.09  
Weighted Average Exercise Price, Vested and expected to vest (in dollars per share) $ 6.8  
Weighted Average Remaining Contractual Term, Outstanding 8 years 3 months 10 days 7 years 11 months 26 days
Weighted Average Remaining Contractual Term, Options exercisable 7 years 1 month 6 days  
Weighted Average Remaining Contractual Term, Vested and expected to vest 8 years 3 months 10 days  
Aggregate Intrinsic Value, Outstanding $ 539 $ 1,818
Aggregate Intrinsic Value, Options exercisable 55  
Aggregate Intrinsic Value, Vested and expected to vest $ 539