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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jan. 24, 2018
Jan. 04, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Class of Stock [Line Items]          
Common stock, shares outstanding (in shares)   26,281,396 39,403,898   6,795,627
Gross proceeds, offering amount     $ 78,518 $ 0  
Underwriting expenses     $ 5,300    
Common Stock [Member]          
Class of Stock [Line Items]          
Conversion of convertible preferred shares into ordinary shares (in shares)   19,475,788 (19,475,788)    
Number of shares sold (in shares)     6,325,000    
Underwriting Agreement [Member]          
Class of Stock [Line Items]          
Number of shares sold (in shares) 6,325,000        
Options granted (in shares) 825,000        
Public offering price (in dollars per share) $ 13.25        
Gross proceeds, offering amount $ 83,806        
Underwriting expenses 5,288        
Net proceeds, offering amount $ 78,518