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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Licensing revenue	$ 125,000	$ 125,000	$ 375,000	$ 375,000
Operating expenses:
Research and development	2,187,317	3,348,847	9,521,937	9,870,754
General and administrative	1,959,903	1,174,250	7,167,740	4,291,482
Total operating expenses	4,147,220	4,523,097	16,689,677	14,162,236
Loss from operations	(4,022,220)	(4,398,097)	(16,314,677)	(13,787,236)
Other (expense) income:
Gain from change in valuation of earn-out milestone liability	4,114,995	1,246,151	3,567,671	670,172
Impairment of in-process research and development	(4,510,000)	(2,520,000)	(4,510,000)	(2,520,000)
Investment income	106,565	524	253,750	3,941
Interest expense	(345,728)		(360,759)	(91,756)
Other income	2	93	78	3,545
Total other (expense) income, net	(634,166)	(1,273,232)	(1,049,260)	(1,934,098)
Net loss	(4,656,386)	(5,671,329)	(17,363,937)	(15,721,334)
Deemed dividend related to warrant modification				(345,685)
Net loss attributable to common shareholders	$ (4,656,386)	$ (5,671,329)	$ (17,363,937)	$ (16,067,019)
Net loss per common share
Basic and diluted	$ (0.26)	$ (0.70)	$ (1.00)	$ (3.04)
Weighted average shares outstanding
Basic and diluted	17,801,230	8,054,658	17,447,921	5,171,699

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