Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Grant and other revenue		$ 151		$ 377
Operating expenses
Research and development	$ 2,254	1,927	$ 4,832	3,977
General and administrative	1,187	259	2,402	481
Total operating expenses	3,441	2,186	7,234	4,458
Loss from operations	(3,441)	(2,035)	(7,234)	(4,081)
Other income (expense)
Interest income	4		8	1
Change in fair value of preferred stock tranche rights liability and preferred stock warrant liability	(57,940)		(81,157)
Other income	19		28
Total other income (expense)	(57,917)		(81,121)	1
Net loss attributable to common stockholders	$ (61,358)	$ (2,035)	$ (88,355)	$ (4,080)
Net loss per common share, basic and diluted	$ (141.93)	$ (4.86)	$ (207.52)	$ (9.73)
Weighted-average shares outstanding, basic and diluted	432,325	419,124	425,761	419,124