Segment and Geographic Area Information - Summary of Significant Segment Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting [Abstract]
Revenues	$ 43,273	$ 46,018
DURAVYU direct research and development expense	(70,818)	(32,014)
Other direct research and development expense	(2,656)	(714)
Personnel expense (including stock based compensation)	(84,730)	(56,696)
Facilities expense	(3,921)	(2,567)
Depreciation and amortization	(1,540)	(464)
Interest expense	0	(1,247)
Intellectual property expense	(1,361)	(1,233)
Legal, corporate and professional expenses	(10,177)	(10,569)
Provision for income taxes	(90)	(83)
Interest and other income, net	15,088	6,949
Other segment expenses	(13,938)	(18,175)
Net loss	$ (130,870)	$ (70,795)