CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Collaboration revenue	$ 1,156	$ 3,208
Operating expenses:
Research and development	62,002	98,351
General and administrative	31,256	38,138
Restructuring and Other Charges	9,327	0
Total operating expenses	102,585	136,489
Loss from operations	(101,429)	(133,281)
Other income:
Gain on sale of business	0	131,249
Gain on lease termination	8,767	0
Interest income	5,582	3,230
Total other income	14,349	134,479
Income (loss) before income taxes	(87,080)	1,198
Provision for income taxes	0	(715)
Loss from equity method investment	(25,881)	(5,488)
Net loss	$ (112,961)	$ (5,005)
Net loss per share-basic	$ (1.95)	$ (0.09)
Net loss per share-diluted	$ (1.95)	$ (0.09)
Weighted average common shares outstanding-basic	57,834,819	57,399,762
Weighted average common shares outstanding-diluted	57,834,819	57,399,762