Condensed Consolidated Statements of Operations and Comprehensive Income (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]
Collaboration revenue		$ 60,391		$ 126,376
Operating expenses
Research and development	$ 19,858	39,803	$ 49,491	66,375
General and administrative	12,437	11,901	24,979	20,658
Total operating expenses	32,295	51,704	74,470	87,033
Income (loss) from operations	(32,295)	8,687	(74,470)	39,343
Interest income and other, net	1,080	52	1,178	109
Income (loss) before income taxes	(31,215)	8,739	(73,292)	39,452
Income tax expense	(120)	(7,200)	(120)	(7,200)
Net income (loss) and comprehensive income (loss)	$ (31,335)	$ 1,539	$ (73,412)	$ 32,252
Net income (loss) per share attributable to common stockholders
Basic	$ (0.38)	$ 0.02	$ (0.88)	$ 0.39
Diluted	$ (0.38)	$ 0.02	$ (0.88)	$ 0.36
Weighted-average common shares outstanding
Basic	83,257,591	82,743,530	83,217,223	82,662,019
Diluted	83,257,591	88,091,384	83,217,223	88,683,767