Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands		Ordinary Share		Additional Paid-in Capital	Accumulated Deficit	Total
Balance at Dec. 31, 2016		$ 45		$ 114,707	$ (106,492)	$ 8,260
Balance, shares at Dec. 31, 2016		653,530
Cumulative effect to accumulated deficit from adoption of a new accounting standard				11	(11)
Share-based compensation to employees and non-employees				3,654		3,654
Issuance of ordinary shares upon exercise of options to purchase ordinary shares and RSUs by employees and non-employees		$ 1		37		38
Issuance of ordinary shares upon exercise of options to purchase ordinary shares and RSUs by employees and non-employees, shares		6,670
Issuance of ordinary shares in at-the-market offering, net of issuance expenses in the amount of $467		$ 16		9,293		9,309
Issuance of ordinary shares in at-the-market offering, net of issuance expenses in the amount of $467, shares		224,524
Issuance of ordinary shares in follow-on public offering, net of issuance expenses in an amount of $1,117		$ 22		7,141		7,163
Issuance of ordinary shares in follow-on public offering, net of issuance expenses in an amount of $1,117, shares		315,422
Net loss					(24,717)	(24,717)
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				2,766		2,766
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		17,181
Issuance of ordinary shares in investing agreement, net of issuance expenses in an amount of $830	[2]	$ 12		4,283		4,295
Issuance of ordinary shares in investing agreement, net of issuance expenses in an amount of $830, shares	[2]	164,715
Issuance of ordinary shares in at-the-market offering, net of issuance expenses in the amount of $236	[2]	$ 4		1,113		1,117
Issuance of ordinary shares in at-the-market offering, net of issuance expenses in the amount of $236, shares	[2]	49,882
Issuance of ordinary shares, warrants and pre-funded warrants in follow-on public offering, net of issuance expenses in an amount of $1,505	[2]	$ 49		11,528		11,577
Issuance of ordinary shares, warrants and pre-funded warrants in follow-on public offering, net of issuance expenses in an amount of $1,505, shares	[2]	728,019
Modification of warrants to purchase ordinary shares	[3]			18		18
Exercise of pre-funded warrants	[2]	$ 44		119		163
Exercise of pre-funded warrants, shares	[2]	653,144
Net loss					(21,675)	(21,675)
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				1,108		1,108
Issuance of ordinary shares upon exercise of options to purchase ordinary shares and RSUs by employees and non-employees		$ 2				2
Issuance of ordinary shares upon exercise of options to purchase ordinary shares and RSUs by employees and non-employees, shares		47,473
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]	$ 40		1,461		1,501
Exercise of pre-funded warrants and warrants, shares	[2]	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					(15,551)	(15,551)
Balance at Dec. 31, 2019		$ 504		$ 178,745	$ (168,469)	$ 10,780
Balance, shares at Dec. 31, 2019		7,319,560

[1] Represents an amount lower than $1.

[2] See note 8b.

[3] See note 8e.