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Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders' Equity (Deficiency) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Issuance costs, net $ 2,376  
Exercise of stock options 213 127
Common Stock [Member]
    
Exercise of stock options 0 [1] 0 [1]
Exercise of warrants to purchase common stock 0 [1]  
Maximum [Member] | Common Stock [Member]
    
Exercise of stock options 1 1
Exercise of warrants to purchase common stock 1  
Vesting of restricted stock units $ 1  
[1] Represents an amount lower than $ 1.