Condensed Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating expenses:
Research and development	$ 2,816,749	$ 4,246,244	$ 5,601,688	$ 8,192,464
General and administrative	2,953,137	6,919,476	5,139,653	11,150,174
Total operating expenses	5,769,886	11,165,720	10,741,341	19,342,638
Loss from operations	(5,769,886)	(11,165,720)	(10,741,341)	(19,342,638)
Other (expense) income, net:
Interest and other (expense) income, net	(2,317)	143,884	21,801	329,027
Foreign currency transaction gain (loss)	1,402	(19,671)	33	3,399
Total other (expense) income, net	(915)	124,213	21,834	332,426
Net loss	$ (5,770,801)	$ (11,041,507)	$ (10,719,507)	$ (19,010,212)
Net loss per share - basic and diluted	$ (0.56)	$ (1.09)	$ (1.05)	$ (1.88)
Weighted average common shares outstanding - basic and diluted	10,365,767	10,090,883	10,231,437	10,089,133