Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating expenses:
Research and development (includes related party amounts of $362 and $2,426, respectively)	$ 106,683	$ 45,908
In-process research and development - related party		2,500
General and administrative (includes related party amounts of $0 and $40, respectively)	26,662	16,705
Total operating expenses	133,345	65,113
Loss from operations	(133,345)	(65,113)
Other income (expense):
Interest income	9,706	3,875
Interest expense (includes related party amounts of $0 and $717, respectively)	(2,392)	(3,414)
Change in fair value of convertible promissory notes (includes related party amounts of $0 and $13,196, respectively)		(51,469)
Change in fair value of warrant liabilities - related party		(43,575)
Other income (expense)	2,465	(113)
Total other income (expense)	9,779	(94,696)
Net loss	(123,566)	(159,809)
Other comprehensive loss:
Pension and other postemployment benefits	(620)	(281)
Unrealized loss on marketable securities	(6)
Total comprehensive loss	$ (124,192)	$ (160,090)
Net loss per share, basic	$ (3.04)	$ (5.89)
Net loss per share, diluted	$ (3.04)	$ (5.89)
Weighted-average shares of common stock outstanding, basic	40,598,482	27,147,314
Weighted-average shares of common stock outstanding, diluted	40,598,482	27,147,314