Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating expenses:
Research and development	$ 3,164	$ 2,881
General and administrative	4,453	1,826
Total operating expenses	7,617	4,707
Loss from operations	(7,617)	(4,707)
Other income (expense)
Interest income	132	38
Interest expense	(398)
Total other income (expense), net	(266)	38
Loss before benefit from income taxes	(7,883)	(4,669)
Net loss	$ (7,883)	$ (4,669)
Net loss per share (basic and diluted) (in dollars per share)	$ (0.10)	$ (0.13)
Weighted-average common shares (basic and diluted) (in shares)	76,652,190	37,308,232