Preferred Stock and Common Stock - Shares Reserved for Future Issuance (Details) - shares	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2021
Shares for future issuance
Shares reserved for future issuance (in shares)	31,280,585	10,160,112
Prefunded warrants
Shares for future issuance
Shares reserved for future issuance (in shares)	19,509,891
Warrants, Excluding prefunded warrants
Shares for future issuance
Shares reserved for future issuance (in shares)	2,631	2,631
2021 ESPP
Shares for future issuance
Shares reserved for future issuance (in shares)	938,378	701,244	292,031
Stock options and unvested restricted stock units
Shares for future issuance
Shares reserved for future issuance (in shares)	10,829,685	9,456,237