Condensed Statements of Operations and Comprehensive Income (Loss) - USD ($) $ 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	$ 10,956	$ 9,824	$ 21,656	$ 19,506
General and administrative	4,915	5,300	9,580	10,566
Total operating expenses	15,871	15,124	31,236	30,072
Loss from operations	(15,871)	(15,124)	(31,236)	(30,072)
Other income (loss), net	183	(5)	197	(7)
Net loss	(15,688)	(15,129)	(31,039)	(30,079)
Comprehensive income (loss):
Unrealized loss on available-for-sale securities	(72)	0	(72)	0
Comprehensive loss	$ (15,760)	$ (15,129)	$ (31,111)	$ (30,079)
Net loss per share – basic (in dollars per share)	$ (0.28)	$ (0.27)	$ (0.56)	$ (0.55)
Net loss per share – diluted (in dollars per share)	$ (0.28)	$ (0.27)	$ (0.56)	$ (0.55)
Basic weighted average common shares outstanding (in shares)	55,203,709	55,026,404	55,173,789	54,985,639
Diluted weighted average common shares outstanding (in shares)	55,203,709	55,026,404	55,173,789	54,985,639