Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating expenses:
Research and development	$ 6,792,974	$ 3,848,889	$ 13,393,080	$ 7,217,912
General and administrative	2,373,059	1,481,792	4,264,360	3,208,670
Loss from operations	(9,166,033)	(5,330,681)	(17,657,440)	(10,426,582)
Other income (expense):
Interest income	141,956	48,384	264,346	80,002
Interest expense	(26,358)	(26,463)	(54,402)	(53,301)
Total other income (expense), net	115,598	21,921	209,944	26,701
Net loss	$ (9,050,435)	$ (5,308,760)	$ (17,447,496)	$ (10,399,881)
Net loss per share - basic and diluted	$ (0.46)	$ (0.35)	$ (0.88)	$ (0.72)
Weighted average common shares outstanding - basic and diluted	19,761,352	15,136,399	19,761,352	14,470,555