Condensed Statements of Changes in Shareholders' Equity (Deficiency) (Unaudited) - USD ($) $ in Thousands		Ordinary Share		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				2,342		2,342
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		11,140
Issuance of ordinary shares in investment agreement, net of issuance expenses in an amount of $830		$ 12		4,283		4,295
Issuance of ordinary shares in investment 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		$ 4		1,111		1,115
Issuance of ordinary shares in at-the-market offering, net of issuance expense, shares		49,882
Net loss					(16,657)	(16,657)
Balance at Sep. 30, 2018		$ 100		142,579	(147,900)	(5,221)
Balance, shares at Sep. 30, 2018		1,425,883
Balance at Jun. 30, 2018		$ 100		142,003	(143,367)	(1,264)
Balance, shares at Jun. 30, 2018		1,419,355
Share-based compensation to employees and non-employees				523		523
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		2,986
Issuance of ordinary shares in at-the-market offering, net of issuance expenses			[1]	53		53
Issuance of ordinary shares in at-the-market offering, net of issuance expense, shares		3,542
Net loss					(4,533)	(4,533)
Balance at Sep. 30, 2018		$ 100		142,579	(147,900)	(5,221)
Balance, shares at Sep. 30, 2018		1,425,883
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				869		869
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		27,985
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					(11,976)	(11,976)
Balance at Sep. 30, 2019		$ 503		178,506	(164,894)	14,115
Balance, shares at Sep. 30, 2019		7,300,072
Balance at Jun. 30, 2019		$ 503		178,270	(161,505)	17,268
Balance, shares at Jun. 30, 2019		7,289,110
Share-based compensation to employees and non-employees				236		236
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		10,962
Net loss					(3,389)	(3,389)
Balance at Sep. 30, 2019		$ 503		$ 178,506	$ (164,894)	$ 14,115
Balance, shares at Sep. 30, 2019		7,300,072

[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.