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Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]    
Number of Shares, Outstanding, beginning of period 4,485,546  
Number of Shares, Granted 2,270,453  
Number of Shares, Exercised (225)  
Number of Shares, Forfeited or canceled (800,798)  
Number of Shares, Outstanding, Ending of period 5,954,976 4,485,546
Number of Shares, Vested and expected to vest, Ending of period 5,954,976  
Number of Shares, Vested and exercisable, Ending of period 2,741,173  
Weighted-Average Exercise Price, Outstanding, beginning of period $ 6.73  
Weighted-Average Exercise Price, Granted 4.94  
Weighted-Average Exercise Price, Exercised 3.89  
Weighted-Average Exercise Price, Fortified or canceled 5.77  
Weighted-Average Exercise Price, Outstanding, ending of period 6.18 $ 6.73
Weighted-Average Exercise Price, Vested and expected to vest, ending of period 6.18  
Weighted-Average Exercise Price, Vested and exercisable, ending of period $ 6.51  
Weighted Average Remaining Contractual Term (in years), Outstanding 7 years 10 months 13 days 8 years
Weighted Average Remaining Contractual Term (in years), Vested and expected to vest, ending of period 7 years 10 months 13 days  
Weighted Average Remaining Contractual Term (in years), Vested and exercisable, ending of period 6 years 8 months 12 days  
Aggregate Intrinsic Value $ 497 $ 5,646
Aggregate Intrinsic Value, Vested and expected to vest, ending of period 497  
Aggregate Intrinsic Value, Vested and exercisable, ending of period $ 405