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Stock Plans and Stock-Based Compensation - Schedule of Stock Option (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Number of Shares    
Beginning balance (in shares) 1,160,251  
Granted (in shares) 1,388,400  
Exercised (in shares) 0  
Canceled/Forfeited (in shares) (178,825)  
Ending balance (in shares) 2,369,826 1,160,251
Exercisable at end of period (in shares) 795,029  
Vested and unvested expected to vest at end of period (in shares) 2,369,826  
Weighted Average Exercise Price per Share    
Beginning balance (in dollars per share) $ 33.44  
Granted (in dollars per share) 3.04  
Exercised (in dollars per share) 0  
Canceled/Forfeited (in dollars per share) 14.17  
Ending balance (in dollars per share) 17.19 $ 33.44
Exercisable at end of period (in dollars per share) 43.64  
Vested and unvested expected to vest at end of period (in dollars per share) $ 17.19  
Weighted Average Remaining Contractual Life    
Outstanding at end of period 7 years 11 months 8 days 7 years 2 months 8 days
Exercisable at end of period 5 years 6 months 18 days  
Vested and unvested expected to vest at end of period 7 years 11 months 8 days  
Aggregate Intrinsic Value    
Outstanding at end of period $ 0 $ 0
Exercisable at end of period 0  
Vested and unvested expected to vest at end of period $ 0