CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Series D Preferred Stock	Series D & 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 & E Preferred Stock	Treasury Stock	Additional Paid-In Capital	Additional Paid-In Capital Series D & E Preferred Stock	Accumulated Deficit
Beginning Balance (in shares) at Dec. 31, 2019				32	475	1,734,901	131,579	5,267,000			105,000
Beginning Balance at Dec. 31, 2019	$ 21,785			$ 0	$ 0	$ 0	$ 0	$ 1			$ (165)	$ 207,383		$ (185,434)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(7,421)													(7,421)
Stock-based compensation (in shares)								8,000
Stock-based compensation	198											198
Issuance of preferred stock for accrued dividends (in shares)				13
Issuance of preferred stock for accrued dividends	99
Forfeiture of preferred stock (in shares)						(28,618)
Preferred stock conversion (in shares)					475			158,333
Preferred stock dividends	(17)											(17)
Issuance of stock on vested restricted stock units (in shares)								23,000			8,000
Issuance of stock on vested restricted stock units	(16)										$ (16)
Series D exchanged for taxes (in shares)						(8,325)					(8,000)
Forfeiture of restricted stock agreement (in shares)								(9,000)
Issuance of common shares from financing, net of offering costs (in shares)								2,293,000
Issuance of common shares from financing, net of offering costs	7,371											7,371
Issuance of common shares from warrant exercise (in shares)								72,000
Issuance of shares for professional service fees (in shares)								50,000
Issuance of shares for professional service fees	58											58
Ending Balance (in shares) at Dec. 31, 2020				45	0	1,697,958	131,579	7,862,000			113,000
Ending Balance at Dec. 31, 2020	22,057			$ 0	$ 0	$ 0	$ 0	$ 1			$ (181)	215,092		(192,855)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(9,051)													(9,051)
Stock-based compensation	597											597
Forfeiture of preferred stock (in shares)						(81)
Preferred stock conversion (in shares)		1,686,659		45		1,697,022	131,579	18,846,411	84,000	18,762,000
Series D & E Preferred Stock conversion			$ 0							$ 2			$ (2)
Issuance of stock on vested restricted stock units (in shares)								200,000
Series D exchanged for taxes (in shares)						(855)
Issuance of common shares from financing, net of offering costs (in shares)								4,000,000
Issuance of common shares from financing, net of offering costs	11,504											11,504
Issuance of shares for professional service fees (in shares)								21,000
Issuance of shares for professional service fees	390											390
Ending Balance (in shares) at Dec. 31, 2021				0	0	0	0	30,929,000			113,000
Ending Balance at Dec. 31, 2021	$ 25,497			$ 0	$ 0	$ 0	$ 0	$ 3			$ (181)	$ 227,581		$ (201,906)