Condensed 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
Total revenue	$ 79,851	$ 6,568	$ 104,325	$ 10,678
Type of Revenue [Extensible List]	Collaboration Revenue [Member]	Collaboration Revenue [Member]	Collaboration Revenue [Member]	Collaboration Revenue [Member]
Operating expenses:
Research and development	$ 54,534	$ 47,818	$ 107,577	$ 93,551
General and administrative	15,842	14,075	31,396	25,087
Total operating expenses	70,376	61,893	138,973	118,638
Income (loss) from operations	9,475	(55,325)	(34,648)	(107,960)
Other income, net	1,450	178	1,714	642
Income (loss) before income taxes	10,925	(55,147)	(32,934)	(107,318)
Income tax expense	1,042	0	1,800	0
Net income (loss)	9,883	(55,147)	(34,734)	(107,318)
Unrealized loss on marketable securities	(2,289)	(207)	(5,281)	(411)
Comprehensive income (loss)	$ 7,594	$ (55,354)	$ (40,015)	$ (107,729)
Basic net income (loss) per share	$ 0.12	$ (0.69)	$ (0.42)	$ (1.35)
Diluted net income (loss) per share	$ 0.12	$ (0.69)	$ (0.42)	$ (1.35)
Shares used in computing net loss per share, basic	82,394,784	79,790,036	82,248,880	79,598,188
Shares used in computing net loss per share, diluted	82,588,368	79,790,036	82,248,880	79,598,188