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Shareholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2019
Jan. 31, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Class Of Stock [Line Items]          
Ordinary shares, shares authorized 100,000,000     100,000,000  
Ordinary shares, issued 21,026,184     22,071,432  
Ordinary shares, outstanding 21,026,184     22,071,432  
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs       $ 15,777 $ 161,447
Issuance of ordinary shares, net of issuance expenses       $ 15,853 $ 161,662
Cowen and Company Limited Liability Company | ATM Sales Agreement          
Class Of Stock [Line Items]          
Issuance of ordinary shares, shares     700,000    
Issuance of ordinary shares, net of issuance expenses     $ 16,600    
Net proceeds from issuance ordinary shares after deducting sales commissions     15,800    
Issuance of ordinary shares, value, remaining capacity     $ 83,400    
Cowen and Company Limited Liability Company | Maximum | ATM Sales Agreement          
Class Of Stock [Line Items]          
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs $ 100,000        
Underwritten Public Offering          
Class Of Stock [Line Items]          
Issuance of ordinary shares, shares   4,207,317      
Additional ordinary shares exercised under underwriters option to purchase at the public offering price   548,780      
Issuance of ordinary shares, price per share   $ 41.00      
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs   $ 161,400