Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating expenses
Research and development	$ 9,824	$ 4,843	$ 19,506	$ 10,341
General and administrative	5,300	4,926	10,566	8,499
Total operating expenses	15,124	9,769	30,072	18,840
Other income (loss), net	(5)	23	(7)	452
Net loss	$ (15,129)	$ (9,746)	$ (30,079)	$ (18,388)
Net loss per common stock – basic (in dollars per share)	$ (0.27)	$ (0.20)	$ (0.55)	$ (0.37)
Net loss per common stock – diluted (in dollars per share)	$ (0.27)	$ (0.20)	$ (0.55)	$ (0.37)
Basic weighted average common shares outstanding (in shares)	55,026,404	49,392,533	54,985,639	49,280,492
Diluted weighted average common shares outstanding (in shares)	55,026,404	49,392,533	54,985,639	49,280,492