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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Feb. 12, 2021
Jan. 07, 2021
Jan. 27, 2020
Apr. 15, 2019
Jun. 22, 2018
Jan. 31, 2021
Jun. 30, 2021
Ordinary shares | Options              
Subsequent Event              
Number of shares issued in transaction (shares)       630,000 1,323,529    
Ordinary shares | Public Stock Offering              
Subsequent Event              
Number of shares issued in transaction (shares)     7,250,000 4,830,000      
Proceeds of issuance of ordinary shares, net of issuance costs     $ 75.0 $ 108.8      
Per share price of issuance (usd per share)     $ 11.00 $ 24.00      
Subsequent Events              
Subsequent Event              
Restructuring and related cost, number of positions eliminated, period expected percent           20.00%  
Number of shares issued in transaction (shares)   1,700,000          
Proceeds of issuance of ordinary shares, net of issuance costs   $ 15.3          
Cash savings, annual basis per annum           $ 15.0  
Subsequent Events | Forecast              
Subsequent Event              
Restructuring and related cost, incurred cost             $ 2.5
Subsequent Events | Ordinary shares              
Subsequent Event              
Number of shares issued in transaction (shares) 14,285,715            
Proceeds of issuance of ordinary shares, net of issuance costs $ 123.4            
Per share price of issuance (usd per share) $ 7.00            
Subsequent Events | Ordinary shares | Options              
Subsequent Event              
Number of shares issued in transaction (shares) 2,142,857            
Subsequent Events | Ordinary shares | Public Stock Offering              
Subsequent Event              
Proceeds of issuance of ordinary shares, net of issuance costs $ 108.1