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Stock-Based Compensation - Stock Option Activity (Details) - Employee Stock Option - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Shares      
Outstanding, beginning of year (in shares) 6,850,889    
Granted (in shares) 4,056,600    
Exercised (in shares) 0    
Cancelled or forfeited (in shares) (50,182)    
Expired (in shares) (289)    
Outstanding, end of year (in shares) 10,857,018   6,850,889
Vested and exercisable (in shares) 3,057,331    
Vested and expected to vest (in shares) 10,857,018    
Weighted-Average Exercise Price      
Outstanding, beginning of year (in dollars per share) $ 13.75    
Granted (in dollars per share) 6.63    
Cancelled or forfeited (in dollars per share) 10.14    
Expired (in dollars per share) 650.85    
Outstanding at end of year (in dollars per share) 11.09   $ 13.75
Vested and exercisable at end of year (in dollars per share) 14.91    
Vested and expected to vest at end of the year (in dollars per share) $ 11.09    
Weighted Average Remaining Contractual Term (years)      
Outstanding 8 years 9 months 3 days   8 years 3 months 21 days
Vested and exercisable 7 years 3 months 10 days    
Vested and expected to vest 8 years 9 months 3 days    
Aggregate Intrinsic Value      
Outstanding $ 391   $ 2,946
Vested and exercisable 281    
Vested and expected to vest 391    
Additional disclosures      
Intrinsic value of options exercised   $ 100  
Aggregate fair value of options vested $ 8,300 $ 3,200  
Weighted average grant date fair value of options granted (in dollars per share) $ 4.64 $ 10.4  
Unrecognized compensation expense related to unvested stock option awards $ 47,800    
Weighted-average amortization period over which cost is expected to be recognized 3 years 1 month 6 days