CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Collaboration revenue	$ 354	$ 802	$ 1,156	$ 1,604
Operating expenses:
Research and development	22,982	21,075	42,970	45,348
General and administrative	8,188	8,034	16,513	22,181
Total operating expenses	31,170	29,109	59,483	67,529
Loss from operations	(30,816)	(28,307)	(58,327)	(65,925)
Other income
Gain on sale of business	0	0	0	131,249
Interest income	1,511	474	2,980	506
Total other income	1,511	474	2,980	131,755
Income (loss) before income taxes	(29,305)	(27,833)	(55,347)	65,830
Benefit from (provision for) income taxes	0	105	0	(862)
Loss from equity method investment	(5,739)	(1,361)	(8,541)	(1,952)
Net income (loss)	$ (35,044)	$ (29,089)	$ (63,888)	$ 63,016
Net income (loss) per share-basic	$ (0.61)	$ (0.51)	$ (1.11)	$ 1.10
Net income (loss) per share-diluted	$ (0.61)	$ (0.51)	$ (1.11)	$ 1.09
Weighted-average common shares outstanding-basic	57,795,285	57,385,578	57,756,032	57,334,078
Weighted-average common shares outstanding-diluted	57,795,285	57,385,578	57,756,032	57,869,443