Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Grant Revenue	$ 0	$ 867	$ 0	$ 2,878
Operating expenses:
Research and development	5,355	6,632	16,845	16,663
General and administrative	2,500	3,486	8,401	9,895
Total operating expenses	7,855	10,118	25,246	26,558
Operating loss	(7,855)	(9,251)	(25,246)	(23,680)
Other income (expense)
Interest income	296	142	749	230
Interest expense	(750)	(570)	(2,161)	(1,554)
Other income (expense), net	0	38	(29)	(525)
Change in fair value of earn-out liability	6	82	6	12,124
Total other income (expense)	(448)	(308)	(1,435)	10,275
Net loss	(8,303)	(9,559)	(26,681)	(13,405)
Comprehensive loss:
Net loss	(8,303)	(9,559)	(26,681)	(13,405)
Other comprehensive income (loss)	(2)	13	17	(69)
Comprehensive loss	$ (8,305)	$ (9,546)	$ (26,664)	$ (13,474)
Net loss per share, basic	$ (0.13)	$ (0.23)	$ (0.53)	$ (0.33)
Net loss per share, diluted	$ (0.13)	$ (0.23)	$ (0.53)	$ (0.33)
Weighted-average common shares outstanding, basic	61,767,952	41,171,990	50,604,982	41,047,533
Weighted-average common shares outstanding, diluted	61,767,952	41,171,990	50,604,982	41,047,533