Consolidated Statements of Operations and Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue—related party	$ 0	$ 4,814	$ 24,990	$ 833
Operating expenses:
Research and development	16,178	10,616	29,661	22,359
General and administrative	6,529	5,025	13,330	10,655
Total operating expenses	22,707	15,641	42,991	33,014
Loss from operations	(22,707)	(10,827)	(18,001)	(32,181)
Interest income	325	9	357	50
Interest expense	(18)	(51)	(36)	(101)
Other expense, net	(138)	(62)	(240)	(66)
Loss before income tax provision (benefit)	(22,538)	(10,931)	(17,920)	(32,298)
Income tax provision (benefit)	0	(77)	0	(125)
Net loss	$ (22,538)	$ (10,854)	$ (17,920)	$ (32,173)
Weighted-average common shares used in computing net loss per share, basic	40,075,060	31,824,405	39,975,503	28,977,993
Weighted-average common shares used in computing net loss per share, diluted	40,075,060	31,824,405	39,975,503	28,977,993
Net loss per share, basic	$ (0.56)	$ (0.34)	$ (0.45)	$ (1.11)
Net loss per share, diluted	$ (0.56)	$ (0.34)	$ (0.45)	$ (1.11)
Other comprehensive loss:
Unrealized loss on marketable debt securities, net of tax	$ 0	$ (2)	$ 0	$ (24)
Total other comprehensive loss	0	(2)	0	(24)
Comprehensive loss	$ (22,538)	$ (10,856)	$ (17,920)	$ (32,197)