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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Licensing revenue	$ 125,000	$ 125,000	$ 250,000	$ 250,000
Operating expenses:
Research and development	3,558,074	4,593,544	6,325,733	7,334,620
General and administrative	2,136,684	3,542,809	4,354,548	5,207,837
Total operating expenses	5,694,758	8,136,353	10,680,281	12,542,457
Loss from operations	(5,569,758)	(8,011,353)	(10,430,281)	(12,292,457)
Other (expense) income:
(Loss) gain from change in valuation of earn-out milestone liability	(127,061)	(277,129)	3,002,939	(547,324)
Fair value of warrants issued in connection with amendment to modify GEN-1 earn-out milestone payments			(400,000)
Investment income	144,602	73,461	258,393	147,185
Interest expense	(349,448)	(15,031)	(700,195)	(15,031)
Other (expense) income	(2,850)	(504)	(2,823)	76
Total other (expense) income, net	(334,757)	(219,203)	2,158,314	(415,094)
Net loss	$ (5,904,515)	$ (8,230,556)	$ (8,271,967)	$ (12,707,551)
Net loss per common share
Basic and diluted	$ (0.29)	$ (0.46)	$ (0.42)	$ (0.73)
Weighted average shares outstanding
Basic and diluted	20,605,762	17,743,229	19,713,449	17,503,796

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