UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues	$ 1,515	$ 0	$ 2,004	$ 0
Cost of revenues	1,384	0	1,861	0
Gross profit	131	0	143	0
Operating expenses
Research and development	10,137	8,311	22,367	16,279
Selling, general and administrative	5,963	6,262	12,044	12,854
Exit and termination costs (benefits)	(346)	(556)	1,077	3,875
Total operating expenses	15,754	14,017	35,488	33,008
Loss from operations	(15,623)	(14,017)	(35,345)	(33,008)
Interest income	2,209	3,129	4,677	6,525
Gain on disposal of assets	0	0	0	3
Other income, net	0	32	0	32
Net loss	$ (13,414)	$ (10,856)	$ (30,668)	$ (26,448)
Net loss per share, basic (in USD per share)	$ (0.08)	$ (0.06)	$ (0.18)	$ (0.15)
Net loss per share, diluted (in USD per share)	$ (0.08)	$ (0.06)	$ (0.18)	$ (0.15)
Weighted-average shares outstanding, basic (in shares)	175,308,965	173,829,107	174,829,257	176,156,001
Weighted-average shares outstanding, diluted (in shares)	175,308,965	173,829,107	174,829,257	176,156,001
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Research and development services		Research and development services	Research and development services
Government Contract
Operating expenses
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]		Research and development services
Research and development services
Cost of revenues	$ 1,384	$ 0	$ 1,861	$ 0