CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Collaboration revenue	$ 802	$ 1,677	$ 2,406	$ 33,169
Operating expenses:
Research and development	25,854	23,987	71,202	69,439
General and administrative	7,810	8,351	29,991	26,054
Total operating expenses	33,664	32,338	101,193	95,493
Loss from operations	(32,862)	(30,661)	(98,787)	(62,324)
Other income (expense):
Gain on sale of business	0	0	131,249	0
Interest income	1,269	53	1,775	143
Total other income	1,269	53	133,024	143
Income (loss) before income taxes	(31,593)	(30,608)	34,237	(62,181)
Benefit from (provision for) income taxes	46	0	(816)	0
Loss from equity method investment	(2,179)	0	(4,131)	0
Net income (loss)	$ (33,726)	$ (30,608)	$ 29,290	$ (62,181)
Net income (loss) per share-basic	$ (0.59)	$ (0.54)	$ 0.51	$ (1.14)
Net income (loss) per share-diluted	$ (0.59)	$ (0.54)	$ 0.51	$ (1.14)
Weighted-average common shares outstanding-basic	57,447,192	57,106,639	57,372,399	54,704,410
Weighted-average common shares outstanding-diluted	57,447,192	57,106,639	57,901,298	54,704,410