Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Revenue from collaboration agreements	$ 12,006	$ 2,664	$ 15,045	$ 6,423
Operating expenses:
Research and development	23,753	29,926	46,286	58,968
General and administrative	9,695	10,306	19,983	21,251
Restructuring	0	0	2,437	0
Total operating expenses	33,448	40,232	68,706	80,219
Loss from operations	(21,442)	(37,568)	(53,661)	(73,796)
Other income, net:
Interest expense and amortization of long-term debt − related party	0	(600)	0	(1,206)
Interest and other income, net	3,726	2,246	7,584	4,300
Total other income (expense), net	3,726	1,646	7,584	3,094
Loss before income taxes	(17,716)	(35,922)	(46,077)	(70,702)
Income tax expense	0	0	0	0
Net loss	$ (17,716)	$ (35,922)	$ (46,077)	$ (70,702)
Net loss per share − basic (in dollars per share)	$ (0.26)	$ (0.73)	$ (0.67)	$ (1.44)
Net loss per share − diluted (in dollars per share)	$ (0.26)	$ (0.73)	$ (0.67)	$ (1.44)
Weighted-average number of shares used in computed net loss per share − basic	68,810,259	49,063,631	68,621,214	49,048,062
Weighted-average number of shares used in computed net loss per share − diluted	68,810,259	49,063,631	68,621,214	49,048,062
Other comprehensive income (loss)
Unrealized (loss) gain on marketable securities	$ (60)	$ 696	$ (313)	$ 2,363
Comprehensive loss	$ (17,776)	$ (35,226)	$ (46,390)	$ (68,339)
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]			Collaborative Arrangement [Member]	Collaborative Arrangement [Member]