Consolidated Statements of Changes in Equity (Unaudited) - 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								(5,413)	(5,413)
Exercise of pre-funded warrants		[1]					16		16
Exercise of pre-funded warrants, shares	32,034
Issuance of common shares, net of issuance costs		[1]					2,030		2,030
Issuance of common shares, net of issuance costs, shares	499,350
Conversion of Series C Convertible Preferred Stock to common shares						[1]
Conversion of Series C Convertible Preferred Stock to common shares, shares	27,248				(22,617)
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares		[1]					178		178
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares, shares	69,886
Balance at Jun. 30, 2019		[1]		[1]		[1]	158,579	(153,005)	5,574
Balance, shares at Jun. 30, 2019	1,397,133		17,303		38,806
Balance at Mar. 31, 2019		[1]		[1]		[1]	156,439	(150,799)	5,640
Balance, shares at Mar. 31, 2019	871,872		17,303		59,423
Net loss								(2,206)	(2,206)
Issuance of common shares, net of issuance costs		[1]					2,030		2,030
Issuance of common shares, net of issuance costs, shares	499,350
Conversion of Series C Convertible Preferred Stock to common shares						[1]
Conversion of Series C Convertible Preferred Stock to common shares, shares	26,394				(20,617)
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares		[1]					110		110
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares, shares	(483)
Balance at Jun. 30, 2019		[1]		[1]		[1]	158,579	(153,005)	5,574
Balance, shares at Jun. 30, 2019	1,397,133		17,303		38,806
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								(4,458)	(4,458)
Exercise of pre-funded warrants	$ 2						16		18
Exercise of pre-funded warrants, shares	14,856,400
Issuance of common shares, net of issuance costs	$ 1						10,650		10,651
Issuance of common shares, net of issuance costs, shares	10,969,100
Conversion of Series C Convertible Preferred Stock to common shares		[1]				[1]
Conversion of Series C Convertible Preferred Stock to common shares, shares	372,173				(32,027)
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares		[1]					120		120
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares, shares	(40,000)
Settlement of restricted stock units in shares of common stock		[1]
Settlement of restricted stock units in shares of common stock, shares	165,000
Exercise of Warrants F		[1]					1,418		1,418
Exercise of Warrants F, shares	2,866,600
Exercise of Unit Purchase Option to common shares		[1]					82		82
Exercise of Unit Purchase Option to common shares, shares	253,587
Balance at Jun. 30, 2020	$ 3			[1]		[1]	175,301	(162,090)	13,214
Balance, shares at Jun. 30, 2020	33,358,994		17,303		2,343
Balance at Mar. 31, 2020		[1]		[1]		[1]	163,087	(159,610)	3,477
Balance, shares at Mar. 31, 2020	4,338,910		17,303		26,558
Net loss								(2,480)	(2,480)
Exercise of pre-funded warrants	$ 2						12		14
Exercise of pre-funded warrants, shares	14,586,400
Issuance of common shares, net of issuance costs	$ 1						10,650		10,651
Issuance of common shares, net of issuance costs, shares	10,969,100
Conversion of Series C Convertible Preferred Stock to common shares		[1]
Conversion of Series C Convertible Preferred Stock to common shares, shares	344,397				(24,215)
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares							52		52
Exercise of Warrants F		[1]					1,418		1,418
Exercise of Warrants F, shares	2,866,600
Exercise of Unit Purchase Option to common shares		[1]					82		82
Exercise of Unit Purchase Option to common shares, shares	253,587
Balance at Jun. 30, 2020	$ 3			[1]		[1]	$ 175,301	$ (162,090)	$ 13,214
Balance, shares at Jun. 30, 2020	33,358,994		17,303		2,343

[1] Represents an amount less than $1 thousand