Consolidated Statements of Changes in Equity (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Common Stock [Member]		Series B Preferred Stock [Member]		Series C Preferred Stock [Member]		Series D Preferred Stock [Member]		Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2017		[1]		[1]		[1]		[1]	$ 143,079	$ (140,352)	$ 2,727
Balance, shares at Dec. 31, 2017	1,483,556		27,075		741,651		750
Net loss										(2,389)	(2,389)
Issuance of common shares, net of $496 issuance costs		[1]							2,504		2,504
Issuance of common shares, net of $496 issuance costs, shares	1,000,000
Redemption of Series D Preferred Stock								[1]	(450)		(450)
Redemption of Series D Preferred Stock, shares							(450)
Conversion of Series B Preferred Stock to common shares		[1]		[1]					274		274
Conversion of Series B Preferred Stock to common shares, shares	80,620		(9,772)
Conversion of Series C Preferred Stock to common shares		[1]				[1]			936		936
Conversion of Series C Preferred Stock to common shares, shares	825,713				(289,956)
Classification of preferred shares									(3,200)		(3,200)
Accretion of redeemable preferred shares									47		47
Exercise of Unit Purchase Option		[1]							557		557
Exercise of Unit Purchase Option, shares	111,442
Share-based compensation related to restricted stock and stock options award									38		38
Balance at Mar. 31, 2018		[1]		[1]		[1]		[1]	$ 143,785	$ (142,741)	$ 1,044
Balance, shares at Mar. 31, 2018	3,501,331		17,303		451,695		300

[1] Represents an amount less than $1 thousand