CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Collaboration revenue	$ 802	$ 2,187	$ 1,604	$ 31,492
Operating expenses:
Research and development	21,075	23,697	45,348	45,452
General and administrative	8,034	9,042	22,181	17,703
Total operating expenses	29,109	32,739	67,529	63,155
Loss from operations	(28,307)	(30,552)	(65,925)	(31,663)
Other income (expense):
Gain on sale of business			131,249
Interest income	474	52	506	90
Total other income	474	52	131,755	90
Income (loss) before income taxes	(27,833)	(30,500)	65,830	(31,573)
Benefit from (provision for) income taxes	105	0	(862)	0
Loss from equity method investment	(1,361)		(1,952)
Net income (loss)	$ (29,089)	$ (30,500)	$ 63,016	$ (31,573)
Net income (loss) per share-basic	$ (0.51)	$ (0.54)	$ 1.10	$ (0.59)
Net income (loss) per share-diluted	$ (0.51)	$ (0.54)	$ 1.09	$ (0.59)
Weighted-average common shares outstanding-basic	57,385,578	56,497,461	57,334,078	53,429,634
Weighted-average common shares outstanding-diluted	57,385,578	56,497,461	57,869,443	53,429,634