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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Shares      
Shares, Outstanding, Beginning Balance (in shares) 12,939,517    
Shares, Granted (in shares) 2,093,044    
Shares, Exercised (in shares) 0    
Shares, Forfeited or expired (in shares) (276,402)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (96,765)    
Shares, Outstanding, Ending Balance (in shares) 14,659,394   12,939,517
Shares, Exercisable (in shares) 10,148,089    
Shares, Vested and expected to vest (in shares) 14,304,994    
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) 2.40    
Weighted- Average Exercise Price, Exercised (in dollars per share) 0    
Weighted- Average Exercise Price, Forfeited (in dollars per share) 9.55    
Weighted- Average Exercise Price, Expired (in dollars per share) 22.04    
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share) 13.08   $ 14.80
Weighted- Average Exercise Price, Exercisable (in dollars per share) 15.81    
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share) $ 9.43    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Weighted- Average Remaining Contractual Term, Outstanding (in years) 6 years 4 months 24 days   6 years 4 months 24 days
Weighted- Average Remaining Contractual Term, Exercisable (in years) 5 years 4 months 24 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 $ 0    
Aggregate Intrinsic Value, Exercisable 0    
Aggregate Intrinsic Value, Vested and expected to vest $ 0    
Weighted-average grant-date fair value of options granted (in dollars per share) $ 2.03 $ 12.99  
Intrinsic value of options exercised $ 0 $ 2,615  
Fair value of shares vested 9,494 $ 7,344  
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates $ 18,100    
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):
Six Months Ended June 30,
20252024
Weighted-average fair value per share of stock options granted
$2.03 $12.99 
Total intrinsic value of stock options exercised
$— $2,615 
Total cash received for stock options exercised
$— $3,117 
Total grant date fair value of stock options vested
$9,494 $7,344