Year Ended December 31, 2017 Comparative Data (Unaudited) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2017
Costs and Expenses:
Research and development	$ 7,163,530	$ 7,593,715	$ 13,368,165	$ 13,651,987
General and administrative	3,358,091	7,000,444	7,277,951	7,371,885
Loss from Operations	(10,521,621)	(14,594,159)	(20,646,116)	(21,023,872)
Other Income (Expense):
Change in fair value of derivative instruments-warrants and contingent consideration	1,062,769	5,056,964	5,618,598	4,224,819
Loss before income taxes	(9,458,852)	(9,985,295)	(15,027,518)	(16,799,053)
Income tax benefit	1,947,760	536,000	1,947,760	1,908,003
Net loss attributable to Common Stockholders	$ (7,511,092)	$ (17,901,146)	$ (13,079,758)	$ (14,891,050)
Weighted Average Common Shares Outstanding
Basic and Diluted (in shares)			9,678,329
Net loss per Common Share (see note 12)
Basic and Diluted (in dollar per share)			$ (1.35)