Organization, Basis Of Presentation And Significant Accounting And Reporting Policies (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 7,535,000	$ 26,855,000	$ 13,306,000
Restricted cash	253,000	250,000	251,000
Accumulated deficit	(504,965,000)		(498,898,000)
Working capital	4,617,000
Net loss	(6,067,000)	(9,268,000)
Net cash used in operating activities	(5,706,000)	(10,173,000)
Receivable impairment	0	0
Stock-based compensation expense	$ 133,000	$ 838,000
Revision of Prior Period, Error Correction, Adjustment [Member]
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense			$ (262,000)