CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($)	Total	Series D and E Preferred Stock	Preferred Stock Series A-2 Preferred Stock	Preferred Stock Series C Preferred Stock	Preferred Stock Series D Preferred Stock	Preferred Stock Series E Preferred Stock	Common Stock	Common Stock Series A-2 Preferred Stock	Common Stock Series D and E Preferred Stock	Treasury Stock	Additional Paid-In Capital	Additional Paid-In Capital Series D and E Preferred Stock	Accumulated Deficit
Beginning Balance (in shares) at Dec. 31, 2019			32	475	1,734,901	131,579	5,266,828			105,285
Beginning Balance at Dec. 31, 2019	$ 21,785,000		$ 0	$ 0	$ 0	$ 0	$ 1,000			$ (165,000)	$ 207,383,000		$ (185,434,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,129,000)												(3,129,000)
Stock-based compensation	32,000										32,000
Preferred stock conversion (in shares)				(150)			50,000
Issuance of preferred stock for accrued dividends (in shares)			13
Issuance of preferred stock for accrued dividends	98,000										98,000
Forfeited restricted stock (in shares)					(14,441)
Preferred stock dividends	(4,000)										(4,000)
Purchase of treasury stock	(7,000)									$ (7,000)
Ending Balance (in shares) at Mar. 31, 2020			45	325	1,720,460	131,579	5,316,828			105,285
Ending Balance at Mar. 31, 2020	18,775,000		$ 0	$ 0	$ 0	$ 0	$ 1,000			$ (172,000)	207,509,000		(188,563,000)
Beginning Balance (in shares) at Dec. 31, 2019			32	475	1,734,901	131,579	5,266,828			105,285
Beginning Balance at Dec. 31, 2019	21,785,000		$ 0	$ 0	$ 0	$ 0	$ 1,000			$ (165,000)	207,383,000		(185,434,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(8,598,000)
Preferred stock conversion (in shares)							75,000
Ending Balance (in shares) at Sep. 30, 2020			45	250	1,702,010	131,579	5,355,841			113,283
Ending Balance at Sep. 30, 2020	13,345,000		$ 0	$ 0	$ 0	$ 0	$ 1,000			$ (181,000)	207,558,000		(194,033,000)
Beginning Balance (in shares) at Dec. 31, 2019			32	475	1,734,901	131,579	5,266,828			105,285
Beginning Balance at Dec. 31, 2019	21,785,000		$ 0	$ 0	$ 0	$ 0	$ 1,000			$ (165,000)	207,383,000		(185,434,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation										$ (16,000)
Series D Preferred Stock exchanged for taxes (in shares)										(8,000)
Ending Balance (in shares) at Dec. 31, 2020			45		1,697,958	131,579	7,861,912			113,283
Ending Balance at Dec. 31, 2020	22,057,000		$ 0		$ 0	$ 0	$ 1,000			$ (181,000)	215,092,000		(192,855,000)
Beginning Balance (in shares) at Mar. 31, 2020			45	325	1,720,460	131,579	5,316,828			105,285
Beginning Balance at Mar. 31, 2020	18,775,000		$ 0	$ 0	$ 0	$ 0	$ 1,000			$ (172,000)	207,509,000		(188,563,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,385,000)												(3,385,000)
Stock-based compensation	29,000										29,000
Issuance of preferred stock for accrued dividends	1,000										1,000
Forfeited restricted stock (in shares)					(17,364)
Issuance of restricted stock (in shares)							23,334
Preferred stock dividends	(4,000)										(4,000)
Purchase of treasury stock (in shares)										7,998
Purchase of treasury stock	(9,000)									$ (9,000)
Ending Balance (in shares) at Jun. 30, 2020			45	325	1,703,096	131,579	5,340,162			113,283
Ending Balance at Jun. 30, 2020	15,407,000		$ 0	$ 0	$ 0	$ 0	$ 1,000			$ (181,000)	207,535,000		(191,948,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(2,085,000)												(2,085,000)
Stock-based compensation	27,000										27,000
Preferred stock conversion (in shares)				(75)			25,000
Forfeited restricted stock (in shares)					(1,086)		(9,321)
Preferred stock dividends	(4,000)										(4,000)
Ending Balance (in shares) at Sep. 30, 2020			45	250	1,702,010	131,579	5,355,841			113,283
Ending Balance at Sep. 30, 2020	13,345,000		$ 0	$ 0	$ 0	$ 0	$ 1,000			$ (181,000)	207,558,000		(194,033,000)
Beginning Balance (in shares) at Dec. 31, 2020			45		1,697,958	131,579	7,861,912			113,283
Beginning Balance at Dec. 31, 2020	22,057,000		$ 0		$ 0	$ 0	$ 1,000			$ (181,000)	215,092,000		(192,855,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,433,000)												(3,433,000)
Stock-based compensation	33,000										33,000
Preferred stock conversion (in shares)			(45)		(1,697,022)	(131,579)		84,292	18,762,119
Preferred stock conversion		$ 0							$ 2,000			$ (2,000)
Issuance of stock for services (in shares)							21,008
Issuance of stock for services	274,000										274,000
Forfeited restricted stock (in shares)					(81)
Series D Preferred Stock exchanged for taxes (in shares)					(855)
Ending Balance (in shares) at Mar. 31, 2021			0		0	0	26,729,331			113,283
Ending Balance at Mar. 31, 2021	18,931,000		$ 0		$ 0	$ 0	$ 3,000			$ (181,000)	215,397,000		(196,288,000)
Beginning Balance (in shares) at Dec. 31, 2020			45		1,697,958	131,579	7,861,912			113,283
Beginning Balance at Dec. 31, 2020	22,057,000		$ 0		$ 0	$ 0	$ 1,000			$ (181,000)	215,092,000		(192,855,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(6,341,000)
Preferred stock conversion (in shares)							18,846,411
Ending Balance (in shares) at Sep. 30, 2021			0		0	0	30,929,331			113,283
Ending Balance at Sep. 30, 2021	28,145,000		$ 0		$ 0	$ 0	$ 3,000			$ (181,000)	227,519,000		(199,196,000)
Beginning Balance (in shares) at Mar. 31, 2021			0		0	0	26,729,331			113,283
Beginning Balance at Mar. 31, 2021	18,931,000		$ 0		$ 0	$ 0	$ 3,000			$ (181,000)	215,397,000		(196,288,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(2,246,000)												(2,246,000)
Issuance of stock from financing, net of issuance costs (in shares)							4,000,000
Issuance of stock from financing, net of issuance costs	11,504,000										11,504,000
Issuance of stock for services	116,000										116,000
Ending Balance (in shares) at Jun. 30, 2021			0		0	0	30,729,331			113,283
Ending Balance at Jun. 30, 2021	28,305,000		$ 0		$ 0	$ 0	$ 3,000			$ (181,000)	227,017,000		(198,534,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(662,000)												(662,000)
Stock-based compensation	502,000										502,000
Issuance of stock on vested restricted stock units							$ 200,000
Ending Balance (in shares) at Sep. 30, 2021			0		0	0	30,929,331			113,283
Ending Balance at Sep. 30, 2021	$ 28,145,000		$ 0		$ 0	$ 0	$ 3,000			$ (181,000)	$ 227,519,000		$ (199,196,000)