Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Expenses:
Research and development	$ 12,321	$ 16,836	$ 36,681	$ 37,202
General and administrative	6,303	4,452	23,373	10,050
Operating expenses	(18,624)	(21,288)	(60,054)	(47,252)
Other income	0	0	210	0
Interest income, net	37	989	582	1,905
Total other income	37	989	792	1,905
Net loss	(18,587)	(20,299)	(59,262)	(45,347)
Other comprehensive loss
Net unrealized gain on investments	5	0	4	0
Total other comprehensive income	5	0	4	0
Comprehensive loss	$ (18,582)	$ (20,299)	$ (59,258)	$ (45,347)
Net loss per share
Basic and Diluted	$ (0.55)	$ (0.62)	$ (1.77)	$ (1.68)
Weighted average shares outstanding:
Basic and Diluted	33,636,651	32,864,156	33,457,768	26,950,854