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Related Parties - Additional information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Related Party Transactions
Research and development expense	$ 14,828,000	$ 10,785,000	$ 37,049,000	$ 38,602,000
Due to related parties	100,674,000		100,674,000		$ 71,979,000
LaunchLabs Agreement | Subsidiary whose founder and executive chairman of parent is a member of the Company's board of directors | Alexandria LaunchLabs
Related Party Transactions
Research and development expense	25,000	$ 24,000	100,000	$ 100,000
Due to related parties	$ 0		$ 0		$ 8,000,000

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