Consolidated Statements of Changes in Equity (Capital Deficiency) - USD ($) $ in Thousands	Common Stock		Preferred B Stock [Member]		Preferred C Stock [Member]		Preferred D Stock [Member]		Additional Paid-In Capital	Accumulated Deficit	Total
Balance at Dec. 31, 2015		[1]							$ 120,050	$ (122,996)	$ (2,946)
Balance, shares at Dec. 31, 2015	9,433
Net loss										(8,461)	(8,461)
Cumulative effect adjustment related to adoption of share-based compensation standard (ASU 2016-09)									457	(457)
Issuance of common stock, preferred shares and warrants, net of issuance costs				[1]					14,365		14,365
Issuance of common stock, preferred shares and warrants, net of issuance costs, shares	3,384		442,424
Conversion of preferred shares to common shares		[1]		[1]
Conversion of preferred shares to common shares, shares	26,181		(130,903)
Warrants granted to lender in a debt modification									123		123
Share-based compensation related to restricted stock award, net of forfeitures									84		84
Share-based compensation related to restricted stock award, net of forfeitures, shares	3,674
Share-based compensation related to stock options award									894		894
Exercise of options by employee and non-employee		[1]
Exercise of options by employee and non-employee, shares	9
Issuance of shares for options cancelled		[1]
Issuance of shares for options cancelled, shares	8
Taxes withheld in respect of share issuance		[1]							(14)		(14)
Taxes withheld in respect of share issuance, shares	(36)
Balance at Dec. 31, 2016		[1]		[1]					135,959	(131,914)	4,045
Balance, shares at Dec. 31, 2016	42,653		311,521
Net loss										(8,438)	(8,438)
Share-based compensation related to restricted stock award, net of forfeitures		[1]							333		333
Share-based compensation related to restricted stock award, net of forfeitures, shares	(118)
Share-based compensation related to stock options award									339		339
Issuance of shares for options cancelled
Taxes withheld in respect of share issuance		[1]							(10)		(10)
Taxes withheld in respect of share issuance, shares	(657)
Issuance of preferred shares and warrants, net of $776 issuance costs						[1]			6,072		6,072
Issuance of preferred shares and warrants, net of $776 issuance costs, shares					1,069,822
Issuance of preferred shares and warrants, net of $90 issuance costs									660		660
Issuance of preferred shares and warrants, net of $90 issuance costs, shares							750
Conversion of preferred B shares to common shares				[1]					660		660
Conversion of preferred B shares to common shares, shares	1,404,424		(284,446)
Conversion of preferred C shares to common shares		[1]				[1]
Conversion of preferred C shares to common shares, shares	37,506				(328,171)
Classification of Redemption Obligation of preferred shares holder to Mezzanine									(934)		(934)
Balance at Dec. 31, 2017		[1]				[1]		[1]	$ 143,079	$ (140,352)	$ 2,727
Balance, shares at Dec. 31, 2017	1,483,808		27,075		741,651		750

[1] Represents an amount less than $1 thousand