CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Series F Preferred Stock	Preferred Stock Series F Preferred Stock	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit
Preferred stock, beginning balance (in shares) at Dec. 31, 2022			0
Common stock, beginning balance (in shares) at Dec. 31, 2022				2,071,000
Treasury stock, beginning balance (in shares) at Dec. 31, 2022					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
Series F Preferred Stock dividends	0
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
Common stock, ending balance (in shares) at Mar. 31, 2023				2,071,000
Treasury stock, ending balance (in shares) at Mar. 31, 2023					8,000
Ending balance at Mar. 31, 2023	3,902		$ 0	$ 0	$ (181)	229,149	(225,066)
Preferred stock, beginning balance (in shares) at Dec. 31, 2022			0
Common stock, beginning balance (in shares) at Dec. 31, 2022				2,071,000
Treasury stock, beginning balance (in shares) at Dec. 31, 2022					8,000
Beginning balance at Dec. 31, 2022	$ 3,617		$ 0	$ 0	$ (181)	227,645	(223,847)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversions of Series F Preferred Stock (in shares)			(4,620)	14,102,000
Series F Preferred Stock dividends		$ (343)
Preferred stock, ending balance (in shares) at Dec. 31, 2023	1,930	1,930	1,930
Common stock, ending balance (in shares) at Dec. 31, 2023	16,692,124			16,692,000
Treasury stock, ending balance (in shares) at Dec. 31, 2023	8,000				8,000
Ending balance at Dec. 31, 2023	$ 5,501		$ 0	$ 2	$ (181)	233,911	(228,231)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(1,136)						(1,136)
Stock-based compensation	31					31
Conversions of Series F Preferred Stock (in shares)			(922)	3,602,000
Conversions of Series F Preferred Stock including accrued dividends of $82,000	82					82
Series F Preferred Stock dividends	$ (44)	$ (44)				(44)
Preferred stock, ending balance (in shares) at Mar. 31, 2024	1,008	1,008	1,008
Common stock, ending balance (in shares) at Mar. 31, 2024	20,294,228			20,294,000
Treasury stock, ending balance (in shares) at Mar. 31, 2024	8,000			(8,000)	8,000
Ending balance at Mar. 31, 2024	$ 4,434		$ 0	$ 2	$ (181)	$ 233,980	$ (229,367)