Liquidity And Going Concern (Details) - USD ($) $ in Thousands		1 Months Ended	2 Months Ended	3 Months Ended		6 Months Ended
	Aug. 03, 2022	Aug. 31, 2022	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Liquidity And Working Capital [Line Items]
Net loss				$ (4,398)	$ (4,406)	$ (4,066)	$ (6,873)
Net cash used in operating activities						(1,609)	$ (6,101)
Accumulated deficit			$ (437,478)	(437,478)		(437,478)		$ (433,412)
Cash and cash equivalents			846	$ 846		846		$ 1,030
Proceeds from debt						$ 1,400
Convertible Debt [Member]
Liquidity And Working Capital [Line Items]
Proceeds from debt			$ 1,400
Subsequent Event [Member]
Liquidity And Working Capital [Line Items]
Proceeds from debt		$ 300
Subsequent Event [Member] | Convertible Debt [Member]
Liquidity And Working Capital [Line Items]
Proceeds from debt	$ 300