Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Additional Information (Details)

v3.23.3
Share-Based Compensation - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Nov. 24, 2021
Jun. 23, 2021
Jun. 10, 2020
Feb. 14, 2020
Dec. 05, 2018
May 18, 2017
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Mar. 14, 2018
Nov. 18, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Number of Shares, Granted                 857,500      
Vesting period                 4 years      
Employees and Directors                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Unvested employee options outstanding             939,290 301,623 939,290 301,623    
Employees and Directors                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Number of Shares, Granted                 857,500 167,960    
Employee Stock Options                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Expense recognized             $ 124 $ 135 $ 344 $ 3,498    
Unamortized compensation expense share options             1,124 1,094 $ 1,124 $ 1,094    
Vesting period                 2 years 3 months 29 days 1 year 10 months 17 days    
Restricted Share Units (RSUs)                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Expense recognized             18 287 $ 301 $ 803    
Unamortized stock compensation expense             131 712 $ 131 $ 712    
Stock-based compensation expense, expected weighted average period for recognition                 2 years 2 months 1 day 1 year 3 months 7 days    
Restricted Share Units (RSUs) | Director                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Vesting period                 1 year      
Options and Restricted Share Units and Performance Restricted Share Units                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Vesting period                 2 years 3 months 25 days 1 year 8 months 15 days    
Unamortized compensation expense             $ 1,255 $ 1,806 $ 1,255 $ 1,806    
2015 Plan                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Number of shares authorized                       14,895
Number of ordinary shares available for issuance           29,535            
Increase in number of ordinary shares available for issuance           14,640            
2018 Plan                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Number of shares authorized   1,295,819                 67,897  
Increase in number of ordinary shares available to be granted, percentage       4.00% 4.00%              
Increase in number of ordinary shares available to be granted   1,000,000 150,000 39,650 38,272              
2018 Plan | Employees and Directors                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Number of shares, granted/awarded                 0 57,432    
2018 Plan | Restricted Share Units (RSUs) | Employees | Minimum                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Vesting period                 2 years      
2021 Inducement Plan                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Increase in number of ordinary shares available to be granted 333,333                      
2021 Inducement Plan | Restricted Share Units (RSUs) | Employees | Maximum                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Vesting period                 4 years      
2015 Plan, 2018 Plan and 2021 Inducement Plan                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Number of Shares, Granted                 857,500      
2015 Plan, 2018 Plan and 2021 Inducement Plan | Employee Stock Options                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Vesting rights                 The vesting requirement is conditioned upon a grantee’s continued service with the Company during the vesting period. Once vested, all awards are exercisable from the date of grant until they expire. The option grants are non-transferable. Vested options generally remain exercisable for 90 days subsequent to the termination of the option holder’s service with the Company. In the event of an option holder’s disability or death while employed by or providing service to the Company, the exercisable period extends to twelve months or eighteen months, respectively.      
Share option granted term                 10 years