Consolidated Statements of Changes in Equity - 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, 2018		[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]			[1]		[2]
Conversion of Series C Convertible Preferred Stock to common shares, shares	38,614				(27,053)
Share-based compensation related to restricted stock , restricted stock units and stock options award, net of forfeitures of shares		[1]		[1]		[1]	325			325
Share-based compensation related to restricted stock , restricted stock units 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
Net loss								(10,544)		(10,544)
Conversion of Series C Convertible Preferred Stock to common shares		[1]				[1]					[1]
Conversion of Series C Convertible Preferred Stock to common shares, shares	372,173				(32,027)
Share-based compensation related to restricted stock , restricted stock units and stock options award, net of forfeitures of shares		[1]					606			606
Share-based compensation related to restricted stock , restricted stock units and stock options award, net of forfeitures of shares, shares	2,726,165
Exercise of pre-funded warrants	$ 2						16			18
Exercise of pre-funded warrants, shares	14,856,400
Settlement of restricted stock units in shares of common stock		[1]									[1]
Settlement of restricted stock units in shares of common stock, shares	165,000
Issuance of common shares, including at the market offering net of issuance costs	$ 3						15,197			15,200
Issuance of common shares, including at the market offering net of issuance costs, shares	24,108,771
Exercise of Warrants F		[1]					1,418			1,418
Exercise of Warrants F, shares	2,866,600
Exercise of Unit Purchase Option		[1]					82			82
Exercise of Unit Purchase Option, shares	253,587
Balance at Dec. 31, 2020	$ 5	[1]		[1]		[1]	$ 180,334	$ (168,176)		$ 12,163
Balance, shares at Dec. 31, 2020	49,264,830		17,303		2,343

[1] Represents an amount less than $1

[2] Represents an amount less than $1 thousand