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Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders' Equity (Deficiency) (USD $)
In Thousands, except Share data
Total
Preferred Stock [Member]
Preferred Stock [Member]
Series D Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2012 $ (37,448) $ 37,959   $ 4 $ 2,826 $ 0 $ (40,278)
Beginning Balance, Shares at Dec. 31, 2012   14,856,481   3,848,293      
Exercise of warrants to purchase Series D convertible preferred stock     5,816        
Exercise of warrants to purchase Series D convertible preferred stock, Shares     225,660        
Stock-based compensation expense 1,788       1,788    
Exercise of stock options 127     0 [1] 127    
Exercise of stock options, Shares       105,021      
Net loss (7,475)           (7,475)
Ending Balance at Dec. 31, 2013 (43,008) 43,775   4 4,741 0 (47,753)
Ending Balance, Shares at Dec. 31, 2013   15,082,141   3,953,314      
Conversion of warrants to purchase common stock 2,866       2,866    
Exercise of warrants to purchase common stock [1]       0      
Exercise of warrants to purchase common stock, Shares       107,217      
Conversion of preferred stock to common stock upon initial public offering 43,775 (43,775)   15 43,760    
Conversion of preferred stock to common stock upon initial public offering, Shares   (15,082,141)   15,082,141      
Stock-based compensation expense 2,838       2,838    
Exercise of stock options 213     0 [1] 213    
Exercise of stock options, Shares 94,674     120,451      
Exercise of restricted stock units [1]       0      
Exercise of restricted stock units, Shares       885      
Issuance of common stock upon initial public offering, Value 106,071     5 106,066    
Issuance of common stock upon initial public offering, Shares       5,300,436      
Unrealized loss on derivative instruments (542)         (542)  
Net loss (19,067)           (19,067)
Ending Balance at Sep. 30, 2014 $ 93,146 $ 0   $ 24 $ 160,484 $ (542) $ (66,820)
Ending Balance, Shares at Sep. 30, 2014   0   24,564,444      
[1] Represents an amount lower than $ 1.