Grant and Licensing Revenues (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Deferred Revenue Arrangement [Line Items]
Revenue		$ 1,143,177	$ 411,250	$ 1,895,704	$ 435,490
Deferred revenue		5,130,684		5,130,684		$ 7,026,388
Pelican Therapeutics, Inc. [Member]
Deferred Revenue Arrangement [Line Items]
Revenue				800,000
Grant Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Revenue		$ 1,100,000	400,000	1,900,000	400,000
Grant Revenue [Member] | In-process R&D [Member]
Deferred Revenue Arrangement [Line Items]
Revenue			$ 20,000		$ 20,000
Grant Revenue [Member] | Pelican Therapeutics, Inc. [Member]
Deferred Revenue Arrangement [Line Items]
Revenue	$ 15,200,000			$ 1,900,000