Consolidated Statements of Changes in Equity (Unaudited) - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands	Common Stock [Member]		Additional paid-in capital [Member]	Accumulated deficit [Member]	Series B Preferred Stock [Member]		Series C Preferred Stock [Member]		Series D Preferred Stock [Member]		Total
Balance at Dec. 31, 2017		[1]	$ 143,079	$ (140,352)		[1]		[1]		[1]	$ 2,727
Balance, shares at Dec. 31, 2017	1,483,556				27,075		741,651		750
Net loss				(3,016)							(3,016)
Issuance of common shares, net of $1,053 issuance costs		[1]	6,942								6,942
Issuance of common shares, net of $1,053 issuance costs, shares	3,857,143
Redemption of Series D Preferred Stock			(450)							[1]	(450)
Redemption of Series D Preferred Stock, shares									(450)
Conversion of Series B Preferred Stock to common shares		[1]	274			[1]					274
Conversion of Series B Preferred Stock to common shares, shares	80,620				(9,772)
Classification of preferred shares			(3,200)								(3,200)
Conversion of Series C Preferred Stock to common shares		[1]	936					[1]			936
Conversion of Series C Preferred Stock to common shares, shares	920,726						(315,936)
Exercise of Unit Purchase Option		[1]	557								557
Exercise of Unit Purchase Option, shares	111,442
Accretion of redeemable preferred shares			(438)								(438)
Redemption of Series C Preferred Stock			(300)								(300)
Redemption of Series C Preferred Stock, shares							(46,875)
Share-based compensation related to restricted stock and stock options award, net of forfeitures of 59 shares			66								66
Share-based compensation related to restricted stock and stock options award, net of forfeitures of 59 shares, shares	(59)
Balance at Jun. 30, 2018		[1]	$ 147,466	$ (143,368)		[1]		[1]		[1]	$ 4,098
Balance, shares at Jun. 30, 2018	6,453,428				17,303		378,840		300

[1] Represents an amount less than $1 thousand