Income Taxes (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2017
Income Taxes [Abstract]
Uncertain tax positions		$ 0
Unrecognized tax benefits	$ 0			$ 0
Accrued interest and penalties	$ 0			$ 0
Federal statutory rate	21.00%
Reduction in deferred tax assets due to Tax Cuts and Jobs Act	$ 13,600,000
Federal [Member]
Income Taxes [Abstract]
Net operating loss carryforwards		101,500,000
Federal [Member] | Minimum [Member]
Income Taxes [Abstract]
Expiration date of net operating loss carryforwards	Dec. 31, 2029
Federal [Member] | Maximum [Member]
Income Taxes [Abstract]
Expiration date of net operating loss carryforwards	Dec. 31, 2037
New Jersey [Member]
Income Taxes [Abstract]
Net operating loss carryforwards		31,900,000
NOL's sold		26,097,607	$ 19,196,765
Proceeds from sale of NOL's and R&D tax credits		2,586,057	1,845,956
New Jersey [Member] | Minimum [Member]
Income Taxes [Abstract]
Expiration date of net operating loss carryforwards	Dec. 31, 2030
New Jersey [Member] | Maximum [Member]
Income Taxes [Abstract]
Expiration date of net operating loss carryforwards	Dec. 31, 2037
Research and Development Credit [Member] | Federal [Member]
Income Taxes [Abstract]
Tax credit carryforwards		1,900,000
Research and Development Credit [Member] | New Jersey [Member]
Income Taxes [Abstract]
Tax credit carryforwards		400,000
Tax credit carryforwards sold		424,466	$ 257,222
Orphan Drug Credit [Member] | Federal [Member]
Income Taxes [Abstract]
Tax credit carryforwards		$ 22,100,000