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Share-Based Payments - Stock Plan Activity (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2018
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
shares
Dec. 31, 2020
tranche
Dec. 31, 2018
Dec. 31, 2021
$ / shares
Aug. 31, 2021
shares
Dec. 09, 2020
shares
Mar. 04, 2020
shares
Mar. 12, 2019
shares
Share-Based Payments                        
Share-based compensation expense | $   $ 498 $ 779 $ 1,832 $ 2,517              
Stock Options                        
Share-Based Payments                        
Options granted during the period       24,160                
Options exercise price (in dollars per share) | $ / shares   $ 349.79   $ 349.79       $ 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") | 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 | 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 | 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 | Stock Options                        
Share-Based Payments                        
Options granted during the period       23,680                
Options exercise price (in dollars per share) | $ / shares   $ 11.25   $ 11.25                
Share-based compensation expense | $       $ 66                
2020 Share Incentive Plan | Restricted Share Units ("RSUs")                        
Share-Based Payments                        
Restricted stock granted during the period       11,836                
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            
Percentage that vests during the period           25.00%            
Number of vesting periods | tranche           3            
2020 Share Incentive Plan | Ordinary shares                        
Share-Based Payments                        
Shares reserved for future issuance   9,885   9,885                
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   20,000       8,000 8,000