UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues	$ 0	$ 310
Cost of revenues	0	691
Gross loss	0	(381)
Operating expenses
Research and development	7,968	20,918
Selling, general and administrative	6,592	10,981
Exit and termination costs	4,431	0
Total operating expenses	18,991	31,899
Loss from operations	(18,991)	(32,280)
Interest income	3,396	3,462
Gain on disposal of assets	3	2
Other expense, net	0	(15)
Net loss	$ (15,592)	$ (28,831)
Net loss per share, basic (in USD per share)	$ (0.09)	$ (0.16)
Net loss per share, diluted (in USD per share)	$ (0.09)	$ (0.16)
Weighted-average shares outstanding, basic (in shares)	178,482,894	180,118,044
Weighted-average shares outstanding, diluted (in shares)	178,482,894	180,118,044
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Product sales and other	Product sales and other
Product sales and other
Cost of revenues	$ 0	$ 691