Income Tax (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Statutory federal tax rate	34.00%	21.00%
New Federal corporate tax rate for periods beginning on or after January 1, 2018	21.00%
Valuation allowance	$ 18,415,456	$ 21,860,500
Deferred income tax benefit	809,450
State Net Operating Loss Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	63,085,859
Net operating loss carryforwards expiration dates		Dec. 31, 2024
Federal Net Operating Loss Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	68,272,110
Net operating loss carryforwards expiration dates		Dec. 31, 2029
Pelican Therapeutics [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	3,119,000
State Net Pelican Therapeutics [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	2,922,000
Foreign Net Operating Loss Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	98,886
Pelican Net Operating Loss Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 2,238,822