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Stock-based Compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Number of Options    
Exercised (in shares) 0 0
Outstanding stock options    
Number of Options    
Outstanding at beginning of period (in shares)   7,634,937
Granted (in shares)   3,390,691
Exercised (in shares)   0
Cancelled (in shares)   (834,315)
Outstanding at end of period (in shares) 10,191,313 10,191,313
Exercisable at end of period (in shares) 5,948,176 5,948,176
Weighted-Average Exercise Price per Share    
Weighted-Average Exercise Price - Outstanding at beginning of period (in usd per share) | $ / shares   $ 6.24
Weighted-Average Exercise Price - Granted (in usd per share) | $ / shares   1.49
Weighted-Average Exercise Price - Exercised (in usd per share) | $ / shares   0
Weighted-Average Exercise Price - Cancelled (in usd per share) | $ / shares   4.49
Weighted-Average Exercise Price - Outstanding at end of period (in usd per share) | $ / shares $ 4.80 4.80
Weighted-Average Exercise Price - Exercisable at end of period (in usd per share) | $ / shares $ 6.55 $ 6.55
Weighted-Average Remaining
Contractual Life
(in years)    
Weighted Average Remaining Contractual Life - Outstanding   7 years 3 months 21 days
Weighted Average Remaining Contractual Life - Exercisable   6 years 2 months 12 days
Outstanding, Aggregate Intrinsic Value | $ $ 1.7 $ 1.7
Exercisable, Aggregate Intrinsic Value | $ $ 0.3 $ 0.3