CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Collaboration revenue from related party	$ 110,319
Operating expenses:
Research and development	133,849	$ 149,555
General and administrative	66,350	41,704
Total operating expenses	200,199	191,259
Loss from operations	(89,880)	(191,259)
Other income (expense):
Interest and other income (expense), net	23,695	4,300
Interest expense	(3,842)	(1,720)
Total other income, net	19,853	2,580
Loss before income taxes	(70,027)	(188,679)
Income tax (expense) benefit	(663)
Net loss	(70,690)	(188,679)
Other comprehensive loss:
Unrealized gain (loss) on marketable securities	768	(201)
Comprehensive loss	$ (69,922)	$ (188,880)
Net loss per share attributable to common stockholders - basic	$ (1.47)	$ (5.19)
Net loss per share attributable to common stockholders - diluted	$ (1.47)	$ (5.19)
Weighted-average common shares outstanding - basic	48,061,450	36,355,758
Weighted-average common shares outstanding - diluted	48,061,450	36,355,758