STATEMENTS OF OPERATIONS - 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	$ 13,968	$ 8,641	$ 38,725	$ 28,115
General and administrative	6,353	4,807	18,862	13,707
Total operating expenses	20,321	13,448	57,587	41,822
Loss from operations	(20,321)	(13,448)	(57,587)	(41,822)
Other income, net	6	203	383	523
Non-cash inducement warrant expense		(60,751)		(60,751)
Net loss	$ (20,315)	$ (73,996)	$ (57,204)	$ (102,050)
Basic and diluted net loss per share	$ (0.10)	$ (0.43)	$ (0.27)	$ (0.62)
Weighted average common shares outstanding used to compute basic and diluted net loss per share	212,837,367	170,613,712	208,497,410	164,053,029