Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Common Stock [Member]		Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Series B Convertible Preferred Stock [Member]		Series C Convertible Preferred Stock [Member]		Series D Preferred Stock [Member]		Total
Balance at Dec. 31, 2016		[1]	$ 135,959	$ (131,914)		[1]					$ 4,045
Balance, shares at Dec. 31, 2016	42,401				311,521
Net loss				(8,438)							(8,438)
Issuance of Preferred shares and warrants, net of $776 issuance costs			$ 6,072					[1]			$ 6,072
Issuance of Preferred shares and warrants, net of $776 issuance costs, shares							1,069,822
Issuance of preferred shares, net of $90 issuance costs			$ 660							[1]	$ 660
Issuance of preferred shares, net of $90 issuance costs, shares									750
Conversion of Series B Convertible Preferred Stock to common shares		[1]	$ 660			[1]					$ 660
Conversion of Series B Convertible Preferred Stock to common shares, shares	1,404,424				(284,446)
Conversion of Series C Convertible Preferred Stock to common shares		[1]						[1]				[1]
Conversion of Series C Convertible Preferred Stock to common shares, shares	37,506						(328,171)
Classification of Redemption Obligation of preferred shares holder to Mezzanine			$ (934)								$ (934)
Share-based compensation related to restricted stock award, net of forfeitures of shares		[1]	333								333
Share-based compensation related to restricted stock award, net of forfeitures of shares, shares	(118)
Share-based compensation related to stock options award			339								339
Taxes withheld in respect of share issuance		[1]	$ (10)								$ (10)
Taxes withheld in respect of share issuance, shares	(657)
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				(7,240)							(7,240)
Conversion of Series B Convertible Preferred Stock to common shares		[1]	274			[1]					274
Conversion of Series B Convertible Preferred Stock to common shares, shares	80,620				(9,772)
Conversion of Series C Convertible Preferred Stock to common shares		[1]	936					[1]			936
Conversion of Series C Convertible Preferred Stock to common shares, shares	1,144,726						(326,436)
Classification of Redemption Obligation of preferred shares holder to Mezzanine											620
Share-based compensation related to restricted stock award, net of forfeitures of shares		[1]	70								70
Share-based compensation related to restricted stock award, net of forfeitures of shares, shares	(201)
Issuance of common shares, warrants, Pre-funded warrants and exercise of pre-funded warrants, net of $2,206 issuance costs	$ 4		15,823								15,827
Issuance of common shares, warrants, Pre-funded warrants and exercise of pre-funded warrants, net of $2,206 issuance costs shares	35,588,810				442,424		1,069,822
Redemption of Series D Preferred Stock			(750)							[1]	(750)
Redemption of Series D Preferred Stock, shares									(750)
Classification of Series C Convertible Preferred Stock			(3,200)					[1]			(3,200)
Classification of Series C Convertible Preferred Stock, shares							(353,792)
Exercise of Unit Purchase Option		[1]	$ 557								557
Exercise of Unit Purchase Option, shares	111,442
Accretion of redeemable preferred shares			$ (438)								(438)
Balance at Dec. 31, 2018	$ 4		$ 156,351	$ (147,592)		[1]		[1]		[1]	$ 8,763
Balance, shares at Dec. 31, 2018	38,408,953				17,303		61,423

[1] Represents an amount less than $1 thousand