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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Shares      
Shares, Outstanding, Beginning Balance (in shares) 12,939,517    
Shares, Granted (in shares) 2,874,944    
Shares, Exercised (in shares) 0    
Shares, Forfeited or expired (in shares) (393,733)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (210,693)    
Shares, Outstanding, Ending Balance (in shares) 15,210,035   12,939,517
Shares, Exercisable (in shares) 10,698,518    
Shares, Vested and expected to vest (in shares) 14,880,587    
Weighted- Average Exercise Price      
Weighted- Average Exercise Price, Outstanding, Beginning Balance (in dollars per share) $ 14.80    
Weighted- Average Exercise Price, Granted (in dollars per share) 2.19    
Weighted- Average Exercise Price, Exercised (in dollars per share) 0    
Weighted- Average Exercise Price, Forfeited (in dollars per share) 9.23    
Weighted- Average Exercise Price, Expired (in dollars per share) 21.29    
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share) 12.47   $ 14.80
Weighted- Average Exercise Price, Exercisable (in dollars per share) 15.18    
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share) $ 12.59    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Weighted- Average Remaining Contractual Term, Outstanding (in years) 6 years 3 months 18 days   6 years 4 months 24 days
Weighted- Average Remaining Contractual Term, Exercisable (in years) 5 years 3 months 18 days    
Weighted- Average Remaining Contractual Term, Vested and expected to vest (in years) 6 years 3 months 18 days    
Aggregate Intrinsic Value, Outstanding, Ending Balance $ 136    
Aggregate Intrinsic Value, Exercisable 22    
Aggregate Intrinsic Value, Vested and expected to vest $ 128    
Weighted-average grant-date fair value of options granted (in dollars per share) $ 1.85 $ 12.79  
Intrinsic value of options exercised $ 0 $ 2,616  
Fair value of shares vested 12,836 $ 13,533  
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates $ 17,300    
Unrecognized compensation expense recognition period (in years) 1 year 3 months 18 days    
Stock Option Additional Information [Table] The following table summarizes additional information on stock options (in thousands, except per share amounts):
Nine Months Ended September 30,
20252024
Weighted-average fair value per share of stock options granted
$1.85 $12.79 
Total intrinsic value of stock options exercised
$— $2,616 
Total cash received for stock options exercised
$— $3,122 
Total grant date fair value of stock options vested
$12,836 $13,533