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Share Based Payments - Stock Plan Activity (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2018
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
tranche
Dec. 31, 2019
USD ($)
Dec. 31, 2018
tranche
Sep. 30, 2021
shares
Aug. 31, 2021
shares
Mar. 04, 2021
shares
Dec. 09, 2020
shares
Mar. 12, 2019
shares
Share-Based Payments                      
Share-based compensation expense | $   $ 1,967 $ 3,291   $ 5,219            
Stock Options                      
Share-Based Payments                      
Options granted during the period   24,160                  
Options exercise price (in dollars per share) | $ / shares   $ 351.24 $ 510.34                
Restricted Share Units ("RSUs")                      
Share-Based Payments                      
Restricted stock granted during the period   19,566                  
Stock Option Plan 2015 | Stock Options                      
Share-Based Payments                      
Vesting period   4 years                  
Stock Option Plan 2015 | Stock Options | Vesting period, year one                      
Share-Based Payments                      
Percentage that vests during the period   25.00%                  
Stock Option Plan 2015 | Stock Options | Vesting period, years 2-4                      
Share-Based Payments                      
Percentage that vests during the period   75.00%                  
Monthly vesting percentage   2.083%                  
Stock Option Plan 2015 | Maximum | Stock Options                      
Share-Based Payments                      
Exercise period   10 years                  
2017 Share Incentive Plan | Restricted Share Units ("RSUs")                      
Share-Based Payments                      
Vesting period   4 years                  
Percentage that vests during the period   25.00%                  
2017 Share Incentive Plan | Restricted Share Units ("RSUs") | XENLETA                      
Share-Based Payments                      
Vesting period           6 months          
Number of vesting periods | tranche           3          
2017 Share Incentive Plan | Restricted Share Units ("RSUs") | Immediate vesting upon regulatory approval | XENLETA                      
Share-Based Payments                      
Percentage that vests during the period           50.00%          
2017 Share Incentive Plan | Restricted Share Units ("RSUs") | Immediate vesting upon regulatory approval | CONTEPO                      
Share-Based Payments                      
Percentage that vests during the period           50.00%          
2017 Share Incentive Plan | Restricted Share Units ("RSUs") | Vesting upon the one-year-anniversary of FDA approval | XENLETA                      
Share-Based Payments                      
Percentage that vests during the period           50.00%          
2017 Share Incentive Plan | Restricted Share Units ("RSUs") | Vesting upon the one-year-anniversary of FDA approval | CONTEPO                      
Share-Based Payments                      
Percentage that vests during the period           50.00%          
2019 Inducement Plan | Ordinary shares                      
Share-Based Payments                      
Shares reserved for future issuance                     8,000
Inducement Awards Outside of the 2019 Inducement Plan | Vesting period, year one                      
Share-Based Payments                      
Percentage that vests during the period 25.00%                    
Inducement Awards Outside of the 2019 Inducement Plan | Vesting period, year two                      
Share-Based Payments                      
Percentage that vests during the period 75.00%                    
Monthly vesting period 36 months                    
Inducement Awards Outside of the 2019 Inducement Plan | Restricted Share Units ("RSUs") | Chief Executive Officer                      
Share-Based Payments                      
Options granted during the period 600                    
Inducement Awards Outside of the 2019 Inducement Plan | Restricted Share Units ("RSUs") | Upon receipt of FDA approval                      
Share-Based Payments                      
Percentage that vests during the period 50.00%                    
Inducement Awards Outside of the 2019 Inducement Plan | Restricted Share Units ("RSUs") | First anniversary of FDA approval                      
Share-Based Payments                      
Percentage that vests during the period 50.00%                    
Inducement Awards Outside of the 2019 Inducement Plan | Non-statutory option                      
Share-Based Payments                      
Vesting period 4 years                    
Exercise period 10 years                    
Options exercise price (in dollars per share) | $ / shares $ 882.50                    
Inducement Awards Outside of the 2019 Inducement Plan | Non-statutory option | Chief Executive Officer                      
Share-Based Payments                      
Options granted during the period 3,400                    
2020 Share Incentive Plan | Restricted Share Units ("RSUs") | Chief Executive Officer                      
Share-Based Payments                      
Percentage that vests during the period   50.00%                  
Restricted stock granted during the period   280                  
2020 Share Incentive Plan | Restricted Share Units ("RSUs") | Employees                      
Share-Based Payments                      
Vesting period       6 months              
Number of vesting periods | tranche       3              
2020 Share Incentive Plan | Ordinary shares                      
Share-Based Payments                      
Shares reserved for future issuance   12,788                  
2020 Share Incentive Plan | Ordinary shares | Maximum                      
Share-Based Payments                      
Shares reserved for future issuance                 37,200    
2021 Inducement Share Incentive Plan | Maximum                      
Share-Based Payments                      
Term of Awards   ten years                  
2021 Inducement Share Incentive Plan | Ordinary shares                      
Share-Based Payments                      
Shares reserved for future issuance             20,000 8,000   8,000