CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock Series F Preferred Stock	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit
Common stock, beginning balance (in shares) at Dec. 31, 2021			2,071,000
Treasury stock, beginning balance (in shares) at Dec. 31, 2021				8,000
Beginning balance at Dec. 31, 2021	$ 25,497		$ 0	$ (181)	$ 227,584	$ (201,906)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(4,539)					(4,539)
Stock-based compensation	52				52
Forfeiture of unvested stock options	(84)				(84)
Common stock, ending balance (in shares) at Mar. 31, 2022			2,071,000
Treasury stock, ending balance (in shares) at Mar. 31, 2022				8,000
Ending balance at Mar. 31, 2022	$ 20,926		$ 0	$ (181)	227,552	(206,445)
Preferred stock, beginning balance (in shares) at Dec. 31, 2022	0	0
Common stock, beginning balance (in shares) at Dec. 31, 2022	2,063,308		2,071,000
Treasury stock, beginning balance (in shares) at Dec. 31, 2022	7,553			8,000
Beginning balance at Dec. 31, 2022	$ 3,617	$ 0	$ 0	$ (181)	227,645	(223,847)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(1,219)					(1,219)
Stock-based compensation	31				31
Proceeds from private placement, net of fees and amounts held in escrow (in shares)		6,550
Proceeds from private placement, net of fees and amounts held in escrow	$ 1,473				1,473
Preferred stock, ending balance (in shares) at Mar. 31, 2023	6,550	6,550
Common stock, ending balance (in shares) at Mar. 31, 2023	2,063,308	0	2,071,000
Treasury stock, ending balance (in shares) at Mar. 31, 2023	7,553			8,000
Ending balance at Mar. 31, 2023	$ 3,902		$ 0	$ (181)	$ 229,149	$ (225,066)