Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Common Stock [Member]		Series B Convertible Preferred Stock [Member]		Series C Convertible 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	30,106		27,075		741,651		750
Net loss										(7,240)		(7,240)
Issuance of common shares, warrants, Pre-funded warrants and exercise of pre-funded warrants, net of issuance costs		[1]							15,827			15,827
Issuance of common shares, warrants, Pre-funded warrants and exercise of pre-funded warrants, net of issuance costs, shares	711,777
Redemption of Series D Preferred Stock								[1]	(750)			(750)
Redemption of Series D Preferred Stock, shares							(750)
Conversion of Series B Convertible Preferred Stock to common shares		[1]		[1]					274			274
Conversion of Series B Convertible Preferred Stock to common shares, shares	1,613		(9,772)
Classification of Series C Convertible Preferred Stock						[1]			(3,200)			(3,200)
Classification of Series C Convertible Preferred Stock, shares					(353,792)
Conversion of Series C Convertible Preferred Stock to common shares		[1]				[1]			936			936
Conversion of Series C Convertible Preferred Stock to common shares, shares	22,896				(326,436)
Exercise of Unit Purchase Option		[1]							557			557
Exercise of Unit Purchase Option, shares	2,229
Accretion of redeemable preferred shares									(438)			(438)
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares									70			70
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares, shares	(6)
Balance at Dec. 31, 2018		[1]		[1]		[1]		[1]	156,355	(147,592)		8,763
Balance, shares at Dec. 31, 2018	768,615		17,303		61,423
Net loss										(10,040)		(10,040)
Issuance of common shares, warrants, Pre-funded warrants and exercise of pre-funded warrants, net of issuance costs		[1]							6,335			6,335
Issuance of common shares, warrants, Pre-funded warrants and exercise of pre-funded warrants, net of issuance costs, shares	3,039,161
Conversion of Series C Convertible Preferred Stock to common shares		[1]				[1]					[1]
Conversion of Series C Convertible Preferred Stock to common shares, shares	38,614				(27,053)
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares		[1]							325			325
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares, shares	69,744
Balance at Dec. 31, 2019		[1]		[1]		[1]			$ 163,015	$ (157,632)		$ 5,383
Balance, shares at Dec. 31, 2019	3,916,134		17,303		34,370

[1] Represents an amount less than $1 thousand