Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Total revenue	$ 14,852	$ 182,413	$ 119,177	$ 193,091
Type of Revenue [Extensible List]	Collaboration Revenue [Member]	Collaboration Revenue [Member]	Collaboration Revenue [Member]	Collaboration Revenue [Member]
Operating expenses:
Research and development	$ 48,348	$ 43,066	$ 155,925	$ 136,617
General and administrative	14,252	13,018	45,648	38,105
Total operating expenses	62,600	56,084	201,573	174,722
Income (loss) from operations	(47,748)	126,329	(82,396)	18,369
Other income, net	2,333	268	4,047	910
Income (loss) before income taxes	(45,415)	126,597	(78,349)	19,279
Income tax expense	733	0	2,533	0
Net income (loss)	(46,148)	126,597	(80,882)	19,279
Unrealized loss on marketable securities	(518)	(244)	(5,799)	(655)
Comprehensive income (loss)	$ (46,666)	$ 126,353	$ (86,681)	$ 18,624
Basic net income (loss) per share	$ (0.56)	$ 1.56	$ (0.98)	$ 0.24
Diluted net income (loss) per share	$ (0.56)	$ 1.49	$ (0.98)	$ 0.23
Shares used in computing net loss per share, basic	82,602,842	80,964,701	82,367,936	80,048,758
Shares used in computing net loss per share, diluted	82,602,842	85,232,690	82,367,936	82,871,254