Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Number of Shares Underlying Outstanding Options, Beginning balance	9,383,105
Number of Shares Underlying Outstanding Options, Options granted	7,474,253
Number of Shares Underlying Outstanding Options, Options exercised	(92,283)
Number of Shares Underlying Outstanding Options, Options forfeited or cancelled	(1,066,445)
Number of Shares Underlying Outstanding Options, Ending balance	15,698,630	9,383,105
Number of Shares Underlying Outstanding Options exercisable	6,699,537
Number of Shares Underlying Outstanding Options, Vested and expected to vest	15,698,630
Weighted-Average Exercise Price, Outstanding beginning	$ 10.64
Weighted-Average Exercise Price, Options granted	2.48
Weighted-Average Exercise Price, Options exercised	2.12
Weighted-Average Exercise Price, Options forfeited or cancelled	10.66
Weighted-Average Exercise Price, Outstanding ending	3.12	$ 10.64
Weighted-Average Exercise Price, Options exercisable	3.58
Weighted-Average Exercise Price, Vested and expected to vest	$ 3.12
Weighted-Average Remaining Contract Term, Outstanding	8 years 4 months 24 days	8 years 2 months 12 days
Weighted-Average Remaining Contract Term, Options exercisable	7 years 7 months 6 days
Weighted-Average Remaining Contract Term, Vested and expected to vest	8 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding	$ 15	$ 45
Aggregate Intrinsic Value, Options exercisable	1
Aggregate Intrinsic Value, Vested and expected to vest	$ 15