CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Series A-2 Preferred Stock	Preferred Stock Series A-2 Preferred Stock	Preferred Stock Series B 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 C Preferred Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit
Beginning Balance (in shares) at Dec. 31, 2018			32	75	525			5,113,726		132,519
Beginning Balance, value at Dec. 31, 2018	$ 6,830		$ 0	$ 0	$ 0			$ 1		$ (496)	$ 184,998	$ (177,673)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(598)											(598)
Stock-based compensation	29										29
Preferred stock conversion (in shares)				(75)	(50)			(43,402)
Issuance of stock on vested restricted stock units (in shares)								16,824
Preferred stock dividends	(15)										(15)
Issuance of preferred stock for accrued dividends (in shares)			13
Purchase of treasury stock (in shares)										900
Purchase of treasury stock	(1)									$ (1)
Ending Balance (in shares) at Mar. 31, 2019			32.000	0	475.000			5,173,952		133,419
Ending Balance, value at Mar. 31, 2019	6,245		$ 0	$ 0	$ 0			$ 1		$ (497)	185,012	(178,271)
Beginning Balance (in shares) at Dec. 31, 2018			32	75	525			5,113,726		132,519
Beginning Balance, value at Dec. 31, 2018	$ 6,830		$ 0	$ 0	$ 0			$ 1		$ (496)	184,998	(177,673)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock conversion (in shares)					(50)				(16,667)
Forfeited restricted stock (in shares)	10,063
Ending Balance (in shares) at Dec. 31, 2019			32		475	1,734,901	131,579	5,266,828		105,285
Ending Balance, value 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	(3,129)											(3,129)
Stock-based compensation	32										32
Preferred stock conversion (in shares)		(13)			(150)			(50,000)	(50,000)
Forfeited restricted stock (in shares)						(14,441)
Preferred stock dividends	(4)										(4)
Issuance of preferred stock for accrued dividends	98										98
Purchase of treasury stock	(7)									$ (7)
Ending Balance (in shares) at Mar. 31, 2020			45		325	1,720,460	131,579	5,316,828		105,285
Ending Balance, value at Mar. 31, 2020	$ 18,775		$ 0		$ 0	$ 0	$ 0	$ 1		$ (172)	$ 207,509	$ (188,563)