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Stock-Based Compensation - Schedule of Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Number of shares    
Outstanding as at beginning of period (in shares) | shares 11,353,057  
Granted (in shares) | shares 4,739,460  
Exercised (in shares) | shares (234,094)  
Forfeited and cancelled (in shares) | shares (371,993)  
Outstanding as at end of period (in shares) | shares 15,486,430 11,353,057
Options vested and exercisable as at end of period (in shares) | shares 8,162,451  
Options expected to vest as at end of period (in shares) | shares 7,323,979  
Weighted Average Exercise Price    
Outstanding as at beginning of period (in dollars per share) | $ / shares $ 10.28  
Granted (in dollars per share) | $ / shares 4.54  
Exercised (in dollars per share) | $ / shares 2.83  
Forfeited (in dollars per share) | $ / shares 9.25  
Outstanding at end of period (in dollars per share) | $ / shares 8.66 $ 10.28
Options vested and exercisable as at end of period (in dollars per share) | $ / shares 9.99  
Options expected to vest as at end of period (in dollars per share) | $ / shares $ 7.18  
Weighted Average Remaining Contractual Life    
Weighted average remaining contractual life of outstanding options (in years) 7 years 6 months 14 days 6 years 4 months 13 days
Weighted Average Remaining Contractual Life of vested and exercisable options (in years) 6 years 3 months 10 days  
Weighted Average Remaining Contractual Life of expected to vest options (in years) 8 years 11 months 12 days  
Intrinsic value of outstanding options | $ $ 51,958 $ 7,519
Intrinsic Value of vested and exercisable options | $ 24,309  
Intrinsic Value of expected to vest options | $ $ 27,649