CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($)	Total	Series F Preferred Stock	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				2,070,861
Treasury stock, beginning balance (in shares) at Dec. 31, 2021					7,553
Beginning balance at Dec. 31, 2021	$ 25,497,000			$ 0	$ (181,000)	$ 227,584,000	$ (201,906,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(4,539,000)						(4,539,000)
Stock-based compensation	52,000					52,000
Forfeiture of unvested stock options	(84,000)					(84,000)
Common stock, ending balance (in shares) at Mar. 31, 2022				2,070,861
Treasury stock, ending balance (in shares) at Mar. 31, 2022					7,553
Ending balance at Mar. 31, 2022	20,926,000			$ 0	$ (181,000)	227,552,000	(206,445,000)
Common stock, beginning balance (in shares) at Dec. 31, 2021				2,070,861
Treasury stock, beginning balance (in shares) at Dec. 31, 2021					7,553
Beginning balance at Dec. 31, 2021	25,497,000			$ 0	$ (181,000)	227,584,000	(201,906,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(20,724,000)
Series F Preferred Stock dividends	0
Treasury stock, ending balance (in shares) at Sep. 30, 2022					7,553
Ending balance at Sep. 30, 2022	4,803,000			$ 0	$ (181,000)	227,614,000	(222,630,000)
Common stock, beginning balance (in shares) at Mar. 31, 2022				2,070,861
Treasury stock, beginning balance (in shares) at Mar. 31, 2022					7,553
Beginning balance at Mar. 31, 2022	20,926,000			$ 0	$ (181,000)	227,552,000	(206,445,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(9,033,000)						(9,033,000)
Stock-based compensation	31,000					31,000
Common stock, ending balance (in shares) at Jun. 30, 2022				2,070,861
Treasury stock, ending balance (in shares) at Jun. 30, 2022					7,553
Ending balance at Jun. 30, 2022	11,924,000			$ 0	$ (181,000)	227,583,000	(215,478,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(7,152,000)						(7,152,000)
Stock-based compensation	31,000					31,000
Treasury stock, ending balance (in shares) at Sep. 30, 2022					7,553
Ending balance at Sep. 30, 2022	$ 4,803,000			$ 0	$ (181,000)	227,614,000	(222,630,000)
Preferred stock, beginning balance (in shares) at Dec. 31, 2022	0		0
Common stock, beginning balance (in shares) at Dec. 31, 2022	2,070,861			2,070,861
Treasury stock, beginning balance (in shares) at Dec. 31, 2022	7,553				7,553
Beginning balance at Dec. 31, 2022	$ 3,617,000		$ 0	$ 0	$ (181,000)	227,645,000	(223,847,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(1,219,000)						(1,219,000)
Stock-based compensation	31,000					31,000
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	1,473,000					1,473,000
Preferred stock, ending balance (in shares) at Mar. 31, 2023			6,550
Common stock, ending balance (in shares) at Mar. 31, 2023				2,070,861
Treasury stock, ending balance (in shares) at Mar. 31, 2023					7,553
Ending balance at Mar. 31, 2023	$ 3,902,000		$ 0	$ 0	$ (181,000)	229,149,000	(225,066,000)
Preferred stock, beginning balance (in shares) at Dec. 31, 2022	0		0
Common stock, beginning balance (in shares) at Dec. 31, 2022	2,070,861			2,070,861
Treasury stock, beginning balance (in shares) at Dec. 31, 2022	7,553				7,553
Beginning balance at Dec. 31, 2022	$ 3,617,000		$ 0	$ 0	$ (181,000)	227,645,000	(223,847,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,163,000)
Stock-based compensation (in shares)				179,535
Common stock exchanged for pre-funded warrants (in shares)				(406,776)
Conversions of Series F Preferred Stock (in shares)				2,111,337
Series F Preferred Stock dividends	$ (282,000)
Preferred stock, ending balance (in shares) at Sep. 30, 2023	5,146	5,146	5,146
Common stock, ending balance (in shares) at Sep. 30, 2023	4,294,455			4,294,455
Treasury stock, ending balance (in shares) at Sep. 30, 2023	7,553			7,553	7,553
Ending balance at Sep. 30, 2023	$ 6,661,000		$ 0	$ 0	$ (181,000)	233,852,000	(227,010,000)
Preferred stock, beginning balance (in shares) at Mar. 31, 2023			6,550
Common stock, beginning balance (in shares) at Mar. 31, 2023				2,070,861
Treasury stock, beginning balance (in shares) at Mar. 31, 2023					7,553
Beginning balance at Mar. 31, 2023	3,902,000		$ 0	$ 0	$ (181,000)	229,149,000	(225,066,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(1,049,000)						(1,049,000)
Stock-based compensation (in shares)				179,535
Stock-based compensation	411,000					411,000
Warrant exercise, net of fees (in shares)				339,498
Warrant exercise, net of fees	534,000					534,000
Release of escrow from March 2023 private placement	4,000,000					4,000,000
Fees associated with Series F Preferred Stock issuance	(38,000)					(38,000)
Conversions of Series F Preferred Stock (in shares)			(175)	146,587
Conversions of Series F Preferred Stock	4,000					4,000
Series F Preferred Stock dividends	(149,000)	$ (148,744)				(149,000)
Preferred stock, ending balance (in shares) at Jun. 30, 2023		6,375	6,375
Common stock, ending balance (in shares) at Jun. 30, 2023				2,736,481
Treasury stock, ending balance (in shares) at Jun. 30, 2023					7,553
Ending balance at Jun. 30, 2023	7,615,000		$ 0	$ 0	$ (181,000)	233,911,000	(226,115,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(895,000)						(895,000)
Stock-based compensation	31,000					31,000
Common stock exchanged for pre-funded warrants (in shares)				(406,776)
Conversions of Series F Preferred Stock (in shares)			(1,229)	1,964,750
Conversions of Series F Preferred Stock	43,000					43,000
Series F Preferred Stock dividends	$ (133,000)	$ (133,364)				(133,000)
Preferred stock, ending balance (in shares) at Sep. 30, 2023	5,146	5,146	5,146
Common stock, ending balance (in shares) at Sep. 30, 2023	4,294,455			4,294,455
Treasury stock, ending balance (in shares) at Sep. 30, 2023	7,553			7,553	7,553
Ending balance at Sep. 30, 2023	$ 6,661,000		$ 0	$ 0	$ (181,000)	$ 233,852,000	$ (227,010,000)