Stock-Based Compensation - Employee Stock Purchase Plan (Details) - shares		9 Months Ended		12 Months Ended
	Jan. 01, 2024	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2021	Dec. 31, 2023
Stock-Based Compensation
Common stock reserved for issuance (in shares)		31,280,585			10,160,112
2021 ESPP
Stock-Based Compensation
Common stock reserved for issuance (in shares)		938,378		292,031	701,244
Annual increase in number of shares reserved for issuance (as a percent)				1.00%
Additional common stock reserved under the plan (in shares)	276,132
Shares issued under plan (in shares)		38,998	68,929
Shares available for future issuance (in shares)		938,378
2021 ESPP | Maximum
Stock-Based Compensation
Annual increase in number of shares reserved and available for issuance (in shares)				584,062