Liquidity And Going Concern (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Liquidity And Going Concern [Abstract]
Net loss	$ (2,104)	$ (1,668)	$ (8,977)	$ (13,174)
Net cash used in operating activities			(6,920)	(4,182)
Accumulated deficit	(430,059)		(430,059)		$ (421,361)
Cash and cash equivalents	$ 760		760		$ 1,627
Repayments			67	$ 1,251
Proceeds from sale of debt and equity securities			5,200
Repayment of debt and accrued expenses			4,100
Net Proceeds			$ 900