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Stockholders' Equity - Summary of Stock Option Activity (Details) - Equity Incentive Plan - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Number of shares, outstanding beginning balance 9,069,194  
Number of shares, granted 4,450,219  
Number of shares, forfeited (2,570,533)  
Number of shares, outstanding ending balance 10,948,880 9,069,194
Number of shares, exercisable 6,151,152  
Number of shares, vested and expected to vest 10,948,880  
Weighted-average exercise price, outstanding beginning balance $ 10.55  
Weighted-average exercise price, granted 2.12  
Weighted-average exercise price, forfeited 5.64  
Weighted-average exercise price, outstanding ending balance 8.28 $ 10.55
Weighted-average exercise price, exercisable 12.14  
Weighted-average exercise price, vested and expected to vest $ 8.28  
Weighted-average remaining contractual term (in years), outstanding balance 6 years 3 months 18 days 7 years
Weighted-average remaining contractual term (in years), exercisable 4 years 1 month 6 days  
Weighted-average remaining contractual term (in years), vested and expected to vest 6 years 3 months 18 days  
Aggregate intrinsic value, outstanding balance $ 668 $ 263
Aggregate intrinsic value, exercisable 27  
Aggregate intrinsic value, vested and expected to vest $ 668