CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	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 B Preferred Stock	Common Stock Series C Preferred Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit
Beginning Balance, Shares (in shares) at Dec. 31, 2017		32	450	0			4,516,000			65,000
Beginning Balance, Value at Dec. 31, 2017	$ 12,262	$ 0	$ 0				$ 1			$ (352)	$ 183,118	$ (170,505)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(7,168)											(7,168)
Stock-based compensation	365										365
Issuance of preferred stock (in shares)				1,750
Issuance of preferred stock	$ 1,527										1,527
Forfeiture of preferred stock (in shares)	(1,000)
Preferred stock conversion (in shares)			(375)	(1,225)			(542,000)	(133,929)	(408,333)
Preferred stock dividends	$ (12)										(12)
Issuance of stock on vested restricted stock units (in shares)							56,000
Purchase of treasury stock (in shares)										68,000
Purchase of treasury stock	(144)									$ (144)
Ending Balance, Shares (in shares) at Dec. 31, 2018		32	75	525			5,114,000			133,000
Ending Balance, Value at Dec. 31, 2018	6,830	$ 0	$ 0				$ 1			$ (496)	184,998	(177,673)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(7,761)											(7,761)
Stock-based compensation	110										110
Issuance of preferred stock in merger (in shares)					1,736,626
Issuance of preferred stock in merger	$ 18,862										18,862
Forfeiture of preferred stock (in shares)	(10,000)				(1,725)
Preferred stock conversion (in shares)			(75)	(50)			(44,000)	(26,786)	(16,667)
Preferred stock dividends	$ (27)										(27)
Issuance of stock on vested restricted stock units (in shares)							109,000			(76,000)
Issuance of stock on vested restricted stock units										$ 382	(382)
Proceeds from Series E equity offering (in shares)					131,579
Proceeds from Series E equity offering	3,750										3,750
Purchase of treasury stock (in shares)										48,000
Purchase of treasury stock	(51)									$ (51)
Issuance of warrants to purchase common stock in connection with long term debt	72										72
Ending Balance, Shares (in shares) at Dec. 31, 2019		32	0	475.000	1,734,901	131,579	5,267,000			105,000
Ending Balance, Value at Dec. 31, 2019	$ 21,785	$ 0	$ 0				$ 1			$ (165)	$ 207,383	$ (185,434)