Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Collaboration revenue		$ 32,811		$ 159,187
Operating expenses
Research and development	$ 4,905	43,019	$ 54,396	109,394
General and administrative	11,376	11,939	36,355	32,597
Total operating expenses	16,281	54,958	90,751	141,991
Income (loss) from operations	(16,281)	(22,147)	(90,751)	17,196
Interest income and other, net	4,382	53	5,560	162
Income (loss) before income taxes	(11,899)	(22,094)	(85,191)	17,358
Income tax benefit (expense)	3,833	(6,100)	3,713	(13,300)
Net income (loss)	(8,066)	(28,194)	(81,478)	4,058
Other comprehensive income (loss)
Unrealized gains (losses) on available-for-sale investments	(855)		(855)
Comprehensive income (loss)	$ (8,921)	$ (28,194)	$ (82,333)	$ 4,058
Net income (loss) per share attributable to common stockholders
Basic	$ (0.10)	$ (0.34)	$ (0.98)	$ 0.05
Diluted	$ (0.10)	$ (0.34)	$ (0.98)	$ 0.05
Weighted-average common shares outstanding
Basic	83,258,537	82,815,636	83,231,146	82,727,268
Diluted	83,258,537	82,815,636	83,231,146	88,462,074