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]		Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2019			[1]		[1]		[1]	$ 163,015		$ (157,632)	$ 5,383
Begining balance, shares at Dec. 31, 2019		261,075		17,303		34,370
Net loss										(4,458)	(4,458)
Exercise of pre-funded warrants			[1]					18			18
Exercise of pre-funded warrants, shares		990,427
Settlement of restricted stock units in shares of common stock	[1]
Settlement of restricted stock units in shares of common stock, shares		11,000
Issuance of common stock, net of $835 issuance costs			[1]					10,651			10,651
Issuance of common stock, net of issuance costs, shares		731,273
Exercise of Warrants F			[1]					1,418			1,418
Exercise of Warrants F, shares		191,107
Exercise of Unit Purchase Option to common stock			[1]					82			82
Exercise of Unit Purchase Option. shares		16,906
Conversion of Series C Convertible Preferred Stock to common stock	[1]
Conversion of Series C Convertible Preferred Stock to common stock, shares		24,812				(32,027)
Share-based compensation related to restricted stock, restricted stock units and stock options award, net of forfeitures of shares			[1]					120			120
Share-based compensation related to restricted stock , restricted stock units and stock options award, net of forfeitures of shares, shares		(2,667)
Ending balance, value at Jun. 30, 2020			[1]		[1]		[1]	175,304		(162,090)	13,214
Ending balance, shares at Jun. 30, 2020		2,223,933		17,303		2,343
Beginning balance, value at Mar. 31, 2020			[2]		[2]		[2]	163,087		(159,610)	3,477
Begining balance, shares at Mar. 31, 2020		289,261		17,303		26,558
Net loss										(2,480)	(2,480)
Exercise of pre-funded warrants			[2]					14			14
Exercise of pre-funded warrants, shares		972,427
Issuance of common stock, net of $835 issuance costs			[2]					10,651			10,651
Issuance of common stock, net of issuance costs, shares		731,273
Exercise of Warrants F			[2]					1,418			1,418
Exercise of Warrants F, shares		191,106
Exercise of Unit Purchase Option to common stock			[2]					82			82
Exercise of Unit Purchase Option. shares		16,906
Conversion of Series C Convertible Preferred Stock to common stock	[2]
Conversion of Series C Convertible Preferred Stock to common stock, shares		22,960				(24,215)
Share-based compensation related to restricted stock, restricted stock units and stock options award, net of forfeitures of shares								52			52
Ending balance, value at Jun. 30, 2020			[1]		[1]		[1]	175,304		(162,090)	13,214
Ending balance, shares at Jun. 30, 2020		2,223,933		17,303		2,343
Beginning balance, value at Dec. 31, 2020			[3]		[3]		[3]	180,339		(168,176)	12,163
Begining balance, shares at Dec. 31, 2020		3,284,322		17,303		2,343
Net loss										(6,750)	(6,750)
Issuance of common stock, including at the market offering net of $2,024 issuance costs		$ 1						25,241			25,242
Issuance of common stock, including at the market offering net of $2,024 issuance costs, shares		3,133,775
Exercise of Warrants F			[3]					8,120			8,120
Exercise of Warrants F, shares		1,093,536
Exercise of Warrants G			[3]					1,349			1,349
Exercise of Warrants G , shares		131,876
Conversion of Series B Convertible Preferred Stock to common stock			[3]		[3]				[3]			[3]
Conversion of Series B Convertible Preferred Stock to common stock, shares		207,528		(17,303)
Conversion of Series C Convertible Preferred Stock to common stock			[3]				[3]		[3]			[3]
Conversion of Series C Convertible Preferred Stock to common stock, shares		831				(625)
Share-based compensation related to restricted stock, restricted stock units and stock options award, net of forfeitures of shares			[3]					706			706
Share-based compensation related to restricted stock , restricted stock units and stock options award, net of forfeitures of shares, shares		15,083
Round up of shares due to reverse stock split effectuated on April 26, 2021			[3]
Round up of shares due to reverse stock split effectuated on April 26, 2021, shares		47,388
Ending balance, value at Jun. 30, 2021		$ 1					[3]	215,755		(174,926)	40,830
Ending balance, shares at Jun. 30, 2021		7,914,339				1,718
Beginning balance, value at Mar. 31, 2021		$ 1					[4]	215,372		(171,419)	43,954
Begining balance, shares at Mar. 31, 2021		7,852,791				1,718
Net loss										(3,507)	(3,507)
Share-based compensation related to restricted stock, restricted stock units and stock options award, net of forfeitures of shares			[4]					383			383
Share-based compensation related to restricted stock , restricted stock units and stock options award, net of forfeitures of shares, shares		14,160
Round up of shares due to reverse stock split effectuated on April 26, 2021			[4]
Round up of shares due to reverse stock split effectuated on April 26, 2021, shares		47,388
Ending balance, value at Jun. 30, 2021		$ 1					[3]	$ 215,755		$ (174,926)	$ 40,830
Ending balance, shares at Jun. 30, 2021		7,914,339				1,718

[1] Represents an amount less than $1 thousand

[2] Represents an amount less than $1 thousand

[3] Represents an amount less than $1 thousand

[4] Represents an amount less than $1 thousand