Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating Expense [Member]
Research and development	$ 8,831	$ 9,791	$ 25,694	$ 20,069
General and administrative	3,095	2,807	9,276	8,698
Total operating expenses	11,926	12,598	34,970	28,767
Loss from operations	(11,926)	(12,598)	(34,970)	(28,767)
Other income	1,962	623	5,891	1,136
Loss before income tax expense	(9,964)	(11,975)	(29,079)	(27,631)
Income tax expense	0	0	0	0
Net loss	$ (9,964)	$ (11,975)	$ (29,079)	$ (27,631)
Net loss per share - basic and diluted (in dollars per share)	$ (0.08)	$ (0.12)	$ (0.23)	$ (0.27)
Basic and diluted weighted average shares outstanding (in shares)	127,424	101,010	126,837	100,939
Other comprehensive loss:
Net loss	$ (9,964)	$ (11,975)	$ (29,079)	$ (27,631)
Unrealized gain (loss) on marketable securities	77	(129)	(128)	(641)
Comprehensive loss	$ (9,887)	$ (12,104)	$ (29,207)	$ (28,272)