STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]		Additional Paid-in Capital [Member]	Accumulated deficit [Member]
Balance at Dec. 31, 2012	$ 3,982	$ 7		$ 51,483	$ (47,508)
Balance (in shares) at Dec. 31, 2012		10,005,644
Stock-based compensation related to warrants and stock granted to service providers	197			197	0
Stock-based compensation related to warrants and stock granted to service providers (in shares)		53,980
Stock-based compensation related to stock and options granted to directors and employees	674			674	0
Stock-based compensation related to stock and options granted to directors and employees (in shares)		50,666
Issuance of shares for public offering	2,497	$ 1		2,496	0
Issuance of shares for public offering (in shares)		1,568,628
Issuance of shares for private placement	250	$ 0	[1]	250	0
Issuance of shares for private placement (in shares)		55,555
Conversion of convertible loans	30	$ 0		30	0
Conversion of convertible loans (in shares)		8,408
Exercise of options	8	$ 0	[1]	8	0
Exercise of options (in shares)		8,000
Net loss	(4,899)	$ 0		0	(4,899)
Balance at Dec. 31, 2013	2,739	$ 8		55,138	(52,407)
Balance (in shares) at Dec. 31, 2013		11,750,881
Stock-based compensation related to warrants and stock granted to service providers	198	$ 0		198	0
Stock-based compensation related to warrants and stock granted to service providers (in shares)		53,419
Stock-based compensation related to stock and options granted to directors and employees	1,024	$ 0		1,024	0
Stock-based compensation related to stock and options granted to directors and employees (in shares)		50,667
Issuance of shares for private placement	9,554	$ 3		9,551	0
Issuance of shares for private placement (in shares)		2,800,000
Stock issued for warrants exchange	1,633	$ 0	[1]	1,633	0
Stock issued for warrants exchange (in shares)		388,735
Warrants liability classified as equity	42	$ 0		42	0
Exercise of warrants	701	$ 0	[1]	701	0
Exercise of warrants (in shares)		180,018
Exercise of options	30	$ 0	[1]	30
Exercise of options (in shares)		57,777
Net loss	(9,246)	$ 0		0	(9,246)
Balance at Dec. 31, 2014	6,675	$ 11		68,317	(61,653)
Balance (in shares) at Dec. 31, 2014		15,281,497
Stock-based compensation related to warrants and stock granted to service providers	108	$ 0		108	0
Stock-based compensation related to warrants and stock granted to service providers (in shares)		27,411
Stock-based compensation related to stock and options granted to directors and employees	668	$ 0		668	0
Stock-based compensation related to stock and options granted to directors and employees (in shares)		60,000
Exercise and reissuance of warrants	12,409	$ 2		12,407	0
Exercise and reissuance of warrants (in shares)		2,546,667
Exercise of liability classified warrants	145	$ 0	[1]	145	0
Exercise of liability classified warrants (in shares)		29,000
Exercise of equity classified warrants	2,333	$ 0	[1]	2,333	0
Exercise of equity classified warrants (in shares)		536,382
Net loss	(4,501)	$ 0		0	(4,501)
Balance at Jun. 30, 2015	$ 17,837	$ 13		$ 83,978	$ (66,154)
Balance (in shares) at Jun. 30, 2015		18,480,957

[1] Represents an amount less than $1.