Liquidity And Going Concern (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Liquidity And Going Concern [Abstract]
Net loss	$ (1,668)	$ (2,119)	$ (13,174)	$ (5,775)
Net cash used in operating activities			(4,182)	$ (3,294)
Accumulated deficit	(414,957)		(414,957)		$ (401,783)
Net working capital	(4,800)		(4,800)
Cash, cash equivalents and available for sale securities	$ 100		100
Proceeds from sale of debt and equity securities			4,300
Proceeds from Warrant Exercises			1,200
Repayment of debt and accrued expenses			$ 700