Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Additional Information (Details)

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Share-Based Compensation - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 24, 2021
Jun. 23, 2021
Jun. 10, 2020
Feb. 14, 2020
Dec. 05, 2018
May 18, 2017
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 14, 2018
Nov. 18, 2015
Employees and Directors                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Share options granted                 0 857,500    
Unvested employee options outstanding             465,795 949,235 465,795 949,235    
Employee Stock Option                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Expense recognized             $ 88 $ 44 $ 211 $ 221    
Unamortized compensation expense share options             432 1,248 $ 432 $ 1,248    
Vesting period                 1 year 8 months 12 days 2 years 6 months 29 days    
Risk-free interest rate based on estimate of U.S. treasury yield                 7 years      
Restricted Share Units (RSUs)                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Benefit recognized related to share based compensation             20   $ 5      
Expense recognized               66   $ 282    
Unamortized compensation expense               149   $ 149    
Stock-based compensation expense, expected weighted average period for recognition                   2 years 5 months 1 day    
Restricted Share Units (RSUs) | Employees and Directors                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Number of shares, granted/awarded                 0 0    
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                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Vesting period                 1 year 8 months 12 days 2 years 6 months 25 days    
Unamortized compensation expense             $ 432 $ 1,397 $ 432 $ 1,397    
2015 Plan                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Number of shares authorized           29,535           14,895
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 | Restricted Share Units (RSUs) | Employees                        
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                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Vesting period                 4 years      
2015 Plan, 2018 Plan and 2021 Inducement Plan | Employee Stock Option                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Vesting period                 4 years      
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      
2015 Plan, 2018 Plan and 2021 Inducement Plan | Employee Stock Option | Director                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Vesting period                 1 year