Condensed Statements of Changes in Shareholders' Equity (Deficiency) (Unaudited) - USD ($) $ in Thousands		Ordinary Share		Receivables on account of shares	Additional paid-in capital	Accumulated deficit	Total
Balance at Dec. 31, 2017		$ 84			$ 134,843	$ (131,220)	$ 3,707
Balance, shares at Dec. 31, 2017		1,200,146
Cumulative effect to accumulated deficit from adoption of a new accounting standard						(23)	(23)
Share-based compensation to employees and non-employees					1,819		1,819
Issuance of ordinary shares upon exercise of options to purchase ordinary shares and RSUs by employees and non-employees			[1]
Issuance of ordinary shares upon exercise of options to purchase ordinary shares and RSUs by employees and non-employees, shares		8,154
Issuance of ordinary shares in a private placement agreement, net of issuance expenses in an amount of $830		$ 12			4,283		4,295
Issuance of ordinary shares in a private placement agreement, net of issuance expenses in an amount of $830, shares		164,715
Issuance of ordinary shares in at-the-market offering, net of issuance expenses in the amount		$ 4			1,058		1,062
Issuance of ordinary shares in at-the-market offering, net of issuance expenses in the amount, shares		46,340
Net loss						(12,124)	(12,124)
Balance at Jun. 30, 2018		$ 100			142,003	(143,367)	(1,264)
Balance, shares at Jun. 30, 2018		1,419,355
Balance at Mar. 31, 2018		$ 86		(42)	136,027	(137,570)	(1,499)
Balance, shares at Mar. 31, 2018		1,220,417
Share-based compensation to employees and non-employees					1,023		1,023
Issuance of ordinary shares upon exercise of options to purchase ordinary shares and RSUs by employees and non-employees			[1]
Issuance of ordinary shares upon exercise of options to purchase ordinary shares and RSUs by employees and non-employees, shares		3,459
Issuance of ordinary shares in a private placement agreement, net of issuance expenses in an amount of $830		$ 12			4,283		4,295
Issuance of ordinary shares in a private placement agreement, net of issuance expenses in an amount of $830, shares		164,715
Issuance of ordinary shares in at-the-market offering, net of issuance expenses in the amount		$ 2		42	670		714
Issuance of ordinary shares in at-the-market offering, net of issuance expenses in the amount, shares		30,764
Net loss						(5,797)	(5,797)
Balance at Jun. 30, 2018		$ 100			142,003	(143,367)	(1,264)
Balance, shares at Jun. 30, 2018		1,419,355
Balance at Dec. 31, 2018		$ 193			154,670	(152,918)	1,945
Balance, shares at Dec. 31, 2018		2,813,087
Share-based compensation to employees and non-employees					633		633
Issuance of ordinary shares upon exercise of options to purchase ordinary shares and RSUs by employees and non-employees		$ 1					1
Issuance of ordinary shares upon exercise of options to purchase ordinary shares and RSUs by employees and non-employees, shares		17,023
Issuance of ordinary shares in a "best efforts" offering, net of issuance expenses in the amount of $686	[2]	$ 52			3,632		3,684
Issuance of ordinary shares in a "best efforts" offering, net of issuance expenses in the amount of $686, shares	[2]	760,000
Exercise of pre-funded warrants and warrants	[2],[3]	$ 40			1,461		1,501
Exercise of pre-funded warrants and warrants, shares	[2],[3]	584,087
Issuance of ordinary shares in a "Registered Direct" offerings , net of issuance expenses in the amount of $1,125	[2]	$ 115			8,010		8,125
Issuance of ordinary shares in a "Registered Direct" offerings , net of issuance expenses in the amount of $1,125, shares	[2]	1,650,248
Issuance of ordinary shares in a "Warrant exercise" agreement, net of issuance expenses in the amount of $1,019	[2]	$ 102			9,864		9,966
Issuance of ordinary shares in a "Warrant exercise" agreement, net of issuance expenses in the amount of $1,019,shares	[2]	1,464,665
Net loss						(8,587)	(8,587)
Balance at Jun. 30, 2019		$ 503			178,270	(161,505)	17,268
Balance, shares at Jun. 30, 2019		7,289,110
Balance at Mar. 31, 2019		$ 253			158,720	(156,918)	2,055
Balance, shares at Mar. 31, 2019		3,695,174
Share-based compensation to employees and non-employees					314		314
Issuance of ordinary shares upon exercise of options to purchase ordinary shares and RSUs by employees and non-employees		$ 1					1
Issuance of ordinary shares upon exercise of options to purchase ordinary shares and RSUs by employees and non-employees, shares		14,817
Exercise of pre-funded warrants and warrants	[2],[3]	$ 32			1,362		1,394
Exercise of pre-funded warrants and warrants, shares	[2],[3]	464,206
Issuance of ordinary shares in a "Registered Direct" offerings , net of issuance expenses in the amount of $1,125	[2]	$ 115			8,010		8,125
Issuance of ordinary shares in a "Registered Direct" offerings , net of issuance expenses in the amount of $1,125, shares	[2]	1,650,248
Issuance of ordinary shares in a "Warrant exercise" agreement, net of issuance expenses in the amount of $1,019	[2]	$ 102			9,864		9,966
Issuance of ordinary shares in a "Warrant exercise" agreement, net of issuance expenses in the amount of $1,019,shares	[2]	1,464,665
Net loss						(4,587)	(4,587)
Balance at Jun. 30, 2019		$ 503			$ 178,270	$ (161,505)	$ 17,268
Balance, shares at Jun. 30, 2019		7,289,110

[1] Represents an amount lower than $1.

[2] See Note 7f to the condensed consolidated financial statements.

[3] See Note 7d to the condensed consolidated financial statements.