Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]		Series B Convertible Preferred Stock [Member]		Series C Convertible Preferred Stock [Member]		Additional Paid-in Capital [Member]		Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2019		[1]		[1]		[1]	$ 163,015		$ (157,632)	$ 5,383
Balance, shares at Dec. 31, 2019	261,075		17,303		34,370
Net loss									(1,978)	(1,978)
Exercise of pre-funded warrants		[1]					3			3
Exercise of pre-funded warrants, shares	18,000
Settlement of restricted stock units in shares of common stock		[1]						[1]			[1]
Settlement of restricted stock units in shares of common stock, shares	11,000
Conversion of Series C Convertible Preferred Stock to common shares		[1]				[1]
Conversion of Series C Convertible Preferred Stock to common shares, shares	1,852				(7,812)
Share-based compensation related to restricted stock , restricted stock units and stock options award, net of forfeitures of shares		[1]					$ 69			$ 69
Share-based compensation related to restricted stock , restricted stock units and stock options award, net of forfeitures of shares, shares	(2,666)
Balance at Mar. 31, 2020		[1]		[1]		[1]	163,087		(159,610)	3,477
Balance, shares at Mar. 31, 2020	289,261		17,303		26,558
Balance at Dec. 31, 2020		[1]		[1]		[1]	180,339		(168,176)	12,163
Balance, shares at Dec. 31, 2020	3,284,322		17,303		2,343
Net loss									(3,243)	(3,243)
Conversion of Series C Convertible Preferred Stock to common shares		[1]				[1]		[1]			[1]
Conversion of Series C Convertible Preferred Stock to common shares, shares	831				(625)
Share-based compensation related to restricted stock , restricted stock units and stock options award, net of forfeitures of shares		[1]					323			323
Share-based compensation related to restricted stock , restricted stock units and stock options award, net of forfeitures of shares, shares	923
Issuance of common shares, including at the market offering net of $2,018 issuance costs	$ 1						25,241			25,242
Issuance of common shares, including at the market offering net of $2,018 issuance costs, shares	3,133,775
Exercise of Warrants F		[1]					8,120			8,120
Exercise of Warrants F, shares	1,093,536
Exercise of Warrants G		[1]					1,349			1,349
Exercise of Warrants G , shares	131,876
Conversion of Series B Convertible Preferred Stock to common shares		[1]		[1]				[1]			[1]
Conversion of Series B Convertible Preferred Stock to common shares, shares	207,528		(17,303)
Balance at Mar. 31, 2021	$ 1			[1]		[1]	$ 215,372		$ (171,419)	$ 43,954
Balance, shares at Mar. 31, 2021	7,852,791				1,718

[1] Represents an amount less than $1 thousand