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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Licensing revenue	$ 125,000	$ 125,000	$ 375,000	$ 375,000
Operating expenses:
Research and development	3,674,239	2,187,317	9,999,972	9,521,937
General and administrative	1,838,287	1,959,903	6,192,835	7,167,740
Total operating expenses	5,512,526	4,147,220	16,192,807	16,689,677
Loss from operations	(5,387,526)	(4,022,220)	(15,817,807)	(16,314,677)
Other (expense) income:
Gain from change in valuation of earn-out milestone liability	85,882	4,114,995	3,088,821	3,567,671
Fair value of warrants issued in connection with amendment to modify GEN-1 earn-out milestone payments			(400,000)
Impairment of in-process research and development		(4,510,000)		(4,510,000)
Investment income	174,439	106,565	432,832	253,750
Interest expense	(349,602)	(345,728)	(1,049,797)	(360,759)
Other (expense) income		2	(2,823)	78
Total other (expense) income, net	(89,281)	(634,166)	2,069,033	(1,049,260)
Net loss	$ (5,476,807)	$ (4,656,386)	$ (13,748,774)	$ (17,363,937)
Net loss per common share
Basic and diluted	$ (0.25)	$ (0.26)	$ (0.67)	$ (1.00)
Weighted average shares outstanding
Basic and diluted	21,662,824	17,801,230	20,524,799	17,447,921

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