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Shareholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Oct. 25, 2017
Oct. 20, 2017
May 31, 2016
May 25, 2016
May 19, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Oct. 31, 2017
Oct. 30, 2016
Shareholder's Equity (Textual)                    
Ordinary shares held by the company           30,843        
Ordinary shares issued     2,090,909              
Offering price per share     $ 11.00           $ 19.50  
Net of issuance costs     $ 21,279     $ 30,206 $ 21,279      
Ordinary shares issued, does not include         1,818,182 5,189 5,189      
Board [Member]                    
Shareholder's Equity (Textual)                    
Shares available for future grants           179,002        
Follow-on public offering [Member]                    
Shareholder's Equity (Textual)                    
Ordinary shares issued   1,444,814     1,818,182          
Offering price per share   $ 19.50     $ 11.00          
Gross proceeds   $ 28,174     $ 20,000          
Other offering expenses   $ 1,940     $ 1,455          
Ordinary shares         272,727          
2017 Public Offering [Member]                    
Shareholder's Equity (Textual)                    
Ordinary shares issued 1,661,536                  
Purchase additional shares, for total consideration $ 30,206                  
Net of issuance costs $ 2,194                  
Stock options [Member]                    
Shareholder's Equity (Textual)                    
Aggregate intrinsic value           679,552        
Options outstanding and exercisable           679,552 624,437      
Weighted average fair values of options granted           $ 8.08 $ 6.68 $ 4.90    
Outstanding options           254,850 330,337      
Underwriters' Option [Member]                    
Shareholder's Equity (Textual)                    
Ordinary shares issued       272,727            
Purchase additional shares, for total consideration       $ 21,279            
Net of issuance costs       $ 1,721            
Ordinary shares       2,090,909            
Underwriters' Option [Member] | 2017 Public Offering [Member]                    
Shareholder's Equity (Textual)                    
Ordinary shares issued 216,722                  
RSUs [Member]                    
Shareholder's Equity (Textual)                    
Shares available for future grants           105,428        
Weighted average fair values of options granted           $ 19.52 $ 14.69 $ 10.60    
Compensation cost           $ 1,335 $ 1,331 $ 342    
Unrecognized costs related to non-vested share-based compensation           $ 4,266        
Recognized over a weighted average period           1 year 2 months 12 days        
RSUs [Member] | Maximum [Member]                    
Shareholder's Equity (Textual)                    
Weighted average fair values of options granted           $ 19.85        
RSUs [Member] | Minimum [Member]                    
Shareholder's Equity (Textual)                    
Weighted average fair values of options granted           $ 18.90        
Exercisable for 30 days [Member] | Follow-on public offering [Member]                    
Shareholder's Equity (Textual)                    
Ordinary shares issued   216,722                
Offering price per share   $ 19.50                
2013 Share Option Plan [Member]                    
Shareholder's Equity (Textual)                    
Shares available for future grants           901,770        
2013 Share Option Plan [Member] | Maximum [Member]                    
Shareholder's Equity (Textual)                    
Increase number of shares reserved under share option plan                   2,450,000
2013 Share Option Plan [Member] | Minimum [Member]                    
Shareholder's Equity (Textual)                    
Increase number of shares reserved under share option plan                   1,250,000