Grant Revenue (Details) - USD ($)	1 Months Ended					12 Months Ended		36 Months Ended
	Dec. 31, 2019	Oct. 31, 2017	May 31, 2017	Jun. 30, 2016	May 31, 2016	Dec. 31, 2019	Dec. 31, 2018	May 31, 2020
Deferred Revenue Arrangement [Line Items]
Revenue						$ 3,049,104	$ 5,793,849
Pelican Therapeutics, Inc.
Deferred Revenue Arrangement [Line Items]
Amount awarded from CPRIT grant				$ 15,200,000	$ 15,200,000			$ 15,200,000
Contribution to be made by Pelican	$ 7,600,000					7,600,000
Pelican Therapeutics, Inc. | Tranche I
Deferred Revenue Arrangement [Line Items]
Revenue			$ 1,800,000
Pelican Therapeutics, Inc. | Tranche II
Deferred Revenue Arrangement [Line Items]
Revenue		$ 6,500,000
Pelican Therapeutics, Inc. | Tranche III
Deferred Revenue Arrangement [Line Items]
Revenue	5,400,000
Pelican Therapeutics, Inc. | Grant revenue
Deferred Revenue Arrangement [Line Items]
Revenue						10,300,000
Grant receivable	$ 1,500,000					$ 1,500,000
Percentage of contribution						0.50%
Pelican Therapeutics, Inc. | Grant revenue | Maximum
Deferred Revenue Arrangement [Line Items]
Royalty percentage after threshold is met						1.00%