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Subsequent Events - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2015
Subsequent Event [Line Items]    
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs   $ 21,255
Secondary Public Offering | Nasdaq | Subsequent Event    
Subsequent Event [Line Items]    
Issuance of ordinary shares, shares 1,682,926  
Issuance of ordinary shares, price per share $ 41.00  
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs $ 64,000  
Additional ordinary shares exercised under underwriters option to purchase at the public offering price 219,512