Stock-Based Compensation - Schedule of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares
Number of Options
Beginning balance, number of options (in shares) | shares	7,919,699
Granted (in shares) | shares	3,677,916
Exercised (in shares) | shares	(307,919)
Forfeited (in shares) | shares	(5,346,477)
Expired (in shares) | shares	(308,725)
Ending balance, number of options (in shares) | shares	5,634,494	7,919,699
Weighted- Average Exercise Price
Beginning balance, weighted-average exercise price (in USD per share) | $ / shares	$ 18.52
Granted (in USD per share) | $ / shares	5.18
Exercised (in USD per share) | $ / shares	4.17
Forfeited (in USD per share) | $ / shares	22.49
Expired (in USD per share) | $ / shares	24.44
Ending balance, weighted-average exercise price (in USD per share) | $ / shares	$ 6.51	$ 18.52
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Exercisable (in shares) | shares	2,120,880
Exercisable, Weighted-Average Exercise Price (in USD per share) | $ / shares	$ 8.16
Remaining Contractual Term (Years)	8 years 14 days	7 years 4 months 6 days
Remaining contractual term, exercisable (years)	6 years 1 month 20 days
Aggregate Intrinsic Value ($, in thousands) | $	$ 23,561	$ 1,435
Intrinsic value, exercisable | $	$ 8,715