Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Total revenue	$ 16,549	$ 24,474
Type of Revenue [Extensible List]	Collaboration Revenue [Member]	Collaboration Revenue [Member]
Operating expenses:
Research and development	$ 51,887	$ 53,043
General and administrative	14,777	15,554
Total operating expenses	66,664	68,597
Loss from operations	(50,115)	(44,123)
Other income, net	5,159	264
Loss before income taxes	(44,956)	(43,859)
Income tax expense	901	758
Net loss	(45,857)	(44,617)
Unrealized gain (loss) on marketable securities	2,376	(2,992)
Comprehensive loss	$ (43,481)	$ (47,609)
Net loss per share, basic	$ (0.55)	$ (0.54)
Net loss per share, diluted	$ (0.55)	$ (0.54)
Shares used in computing net loss per share, basic	83,102,296	82,102,191
Shares used in computing net loss per share, diluted	83,102,296	82,102,191