Condensed Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating expenses
Research and development	$ 9,471	$ 9,896	$ 31,128	$ 29,402
General and administrative	4,138	5,556	13,718	16,122
Total operating expenses	13,609	15,452	44,846	45,524
Loss from operations	(13,609)	(15,452)	(44,846)	(45,524)
Interest income	559	6	766	14
Other income (loss), net	(22)	0	(32)	(15)
Net loss	(13,072)	(15,446)	(44,112)	(45,525)
Comprehensive income (loss):
Unrealized loss on available-for-sale securities	(20)	0	(92)	0
Comprehensive loss	$ (13,092)	$ (15,446)	$ (44,204)	$ (45,525)
Net loss per share – basic (in dollars per share)	$ (0.24)	$ (0.28)	$ (0.80)	$ (0.83)
Net loss per share – diluted (in dollars per share)	$ (0.24)	$ (0.28)	$ (0.80)	$ (0.83)
Basic weighted average common shares outstanding (in shares)	55,251,039	55,087,777	55,199,822	55,020,059
Diluted weighted average common shares outstanding (in shares)	55,251,039	55,087,777	55,199,822	55,020,059