Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating expenses:
Research and development	$ 3,661	$ 1,779	$ 6,825	$ 4,660
General and administrative	6,378	1,768	10,831	3,594
Total operating expenses	10,039	3,547	17,656	8,254
Loss from operations	(10,039)	(3,547)	(17,656)	(8,254)
Other income (expense)
Interest income	115	63	247	101
Interest expense	(902)		(1,300)
Total other income (expense), net	(787)	63	(1,053)	101
Loss before benefit from income taxes	(10,826)	(3,484)	(18,709)	(8,153)
Net loss	$ (10,826)	$ (3,484)	$ (18,709)	$ (8,153)
Net loss per share (basic and diluted) (in dollars per share)	$ (0.12)	$ (0.08)	$ (0.23)	$ (0.20)
Weighted-average common shares (basic and diluted) (in shares)	87,221,441	43,776,549	81,936,815	40,560,259
Comprehensive loss:
Net loss	$ (10,826)	$ (3,484)	$ (18,709)	$ (8,153)
Other comprehensive income:
Unrealized gain on marketable securities	10		10
Comprehensive loss	$ (10,816)	$ (3,484)	$ (18,699)	$ (8,153)