STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $)
In Thousands, except Share data
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    [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    [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    [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    [1] 701 0
Exercise of warrants (in shares)   180,018    
Exercise of options 30    [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 0 0 0 0
Stock-based compensation related to warrants and stock granted to service providers (in shares)   0    
Stock-based compensation related to stock and options granted to directors and employees 347 0 347 0
Stock-based compensation related to stock and options granted to directors and employees (in shares)   0    
Exercise and reissuance of warrants 12,397 2 12,395 0
Exercise and reissuance of warrants (in shares)   2,546,667    
Exercise of liability classified warrants 145    [1] 145 0
Exercise of liability classified warrants (in shares)   29,000    
Exercise of equity classified warrants 2,333    [1] 2,333  
Exercise of equity classified warrants (in shares)   536,382    
Net loss (2,236) 0 0 (2,236)
Balance at Mar. 31, 2015 $ 19,661 $ 13 $ 83,537 $ (63,889)
Balance (in shares) at Mar. 31, 2015   18,393,546    
[1] Represents an amount less than $1