Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating expenses:
Research and development	$ 53,647,067	$ 23,495,055	$ 19,957,616
General and administrative	13,598,030	9,351,522	7,206,691
Total operating expenses	67,245,097	32,846,577	27,164,307
Loss from operations	(67,245,097)	(32,846,577)	(27,164,307)
Interest and amortization of debt discount (expense)	(1,239,537)	(1,127,305)	(1,340,199)
Tax credit	139,448	217,418	207,114
Change in fair value of warrant liabilities		2,791,000	(646,000)
Net loss	$ (68,345,186)	$ (30,965,464)	$ (28,943,392)
Net loss per common share, basic and diluted	$ (2.01)	$ (1.15)	$ (1.27)
Weighted average common shares outstanding, basic and diluted	34,020,257	26,883,656	22,764,606