Quarterly report [Sections 13 or 15(d)]

Share-Based Compensation - Additional Information (Details)

v3.25.1
Share-Based Compensation - Additional Information (Details) - USD ($)
3 Months Ended
Nov. 24, 2021
Jun. 23, 2021
Jun. 10, 2020
Feb. 14, 2020
Dec. 05, 2018
May 18, 2017
Mar. 31, 2025
Mar. 31, 2024
Mar. 14, 2018
Nov. 18, 2015
Employees and Directors                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Unvested employee options outstanding             243,169 635,287    
Employee Stock Option                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Expense recognized             $ 61,000 $ 123,000    
Unamortized compensation expense share options             $ 203,000 $ 877,000    
Vesting period             1 year 1 year 10 months 6 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             $ 0      
Expense recognized               $ 15,000    
Number of shares outstanding             0      
Unamortized compensation expense             $ 0 $ 101,000    
Stock-based compensation expense, expected weighted average period for recognition               1 year 8 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 1 year 9 months 29 days    
Unamortized compensation expense             $ 203,000 $ 978,000    
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