Segment Information - Summary of Segment Performance and Make Decisions About Resource Allocation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Revenues		$ 251
Operating expenses	$ 22,171	14,743
Other income, net	1,860	529
Net Income (Loss)	(20,311)	(13,963)
Personnel-related [Member]
Segment Reporting Information [Line Items]
Operating expenses	9,573	6,815
Other [Member]
Segment Reporting Information [Line Items]
Operating expenses	5,039	4,592
AB-101 [Member]
Segment Reporting Information [Line Items]
Operating expenses	7,545	3,289
Other programs [Member]
Segment Reporting Information [Line Items]
Operating expenses	$ 14	$ 47