Consolidated Statement of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Total Revenues	$ 23	$ 40	$ 52	$ 85
Costs and Expenses:
Production costs	279	200	517	404
Research and development	1,317	1,463	2,742	2,343
General and administrative	2,145	1,717	4,256	3,986
Total Costs and Expenses	3,741	3,380	7,515	6,733
Operating loss	(3,718)	(3,340)	(7,463)	(6,648)
Interest and other income	51	46	120	67
Interest expense and other finance costs	(19)	(249)	(67)	(571)
Extinguishment of financing obligation and note payable	(2,701)	142	(2,701)	142
Gain on sale of fixed assets	216		216
Redeemable warrants valuation adjustment	7	31	(29)	(150)
Gain from sale of Income tax operating losses	288		469
Net Loss	(5,876)	(3,370)	(9,455)	(7,160)
Other comprehensive (loss)
Reclassification adjustment for realized investment loss	25		25
Change in unrealized loss on marketable securities available for sale	(62)	67	(225)	63
Comprehensive loss	$ (5,913)	$ (3,303)	$ (9,655)	$ (7,097)
Basic and diluted loss per share	$ (0.12)	$ (0.11)	$ (0.20)	$ (0.19)
Weighted average shares outstanding basic and diluted	47,832,997	29,970,197	46,805,492	37,073,765
UNITED STATES
Revenues:
Total Revenues	$ 23	$ 40	$ 52	$ 83
Europe [Member]
Revenues:
Total Revenues				$ 2