Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue:
Contract Revenue		$ 1,063	$ 1,096	$ 1,063
Costs and expenses:
Research and development	3,559	4,127	7,530	9,105
General and administrative	2,600	2,861	5,311	5,606
Total costs and expenses	6,159	6,988	12,841	14,711
Loss from operations	(6,159)	(5,925)	(11,745)	(13,648)
Sale of New Jersey net operating losses & tax credits				1,734
Other income, net	99	2	172	13
Net loss	$ (6,060)	$ (5,923)	$ (11,573)	$ (11,901)
Net loss per share - basic	$ (0.03)	$ (0.03)	$ (0.05)	$ (0.06)
Net loss per share - diluted	$ (0.03)	$ (0.03)	$ (0.05)	$ (0.06)
Weighted average common shares outstanding - basic	217,264,526	216,864,526	217,264,526	216,755,261
Weighted average common shares outstanding - diluted	217,264,526	216,864,526	217,264,526	216,755,261
Other comprehensive gain/(loss), net of tax
Unrealized gain/(loss) on securities available-for-sale	$ 81	$ (125)	$ 310	$ (609)
Other comprehensive gain/(loss), net of tax	81	(125)	310	(609)
Comprehensive loss	$ (5,979)	$ (6,048)	$ (11,263)	$ (12,510)