Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating expenses
Research and development	$ 3,433	$ 3,799	$ 4,937	$ 5,177
General and administrative	3,162	3,205	6,411	5,357
Total operating expenses	6,595	7,004	11,348	10,534
Operating loss	(6,595)	(7,004)	(11,348)	(10,534)
Other expense, net	(77)	(35)	(109)	(43)
Loss before income taxes	(6,672)	(7,039)	(11,457)	(10,577)
Income taxes	0	0	0	0
Net loss	$ (6,672)	$ (7,039)	$ (11,457)	$ (10,577)
Loss per common share - basic and diluted (in dollars per share)	$ (0.05)	$ (0.06)	$ (0.09)	$ (0.10)
Weighted average shares outstanding - basic and diluted (in shares)	126,624	121,572	126,624	107,160