Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Additional Information (Details)

v3.23.1
Share-Based Compensation - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 07, 2022
Nov. 24, 2021
Jun. 22, 2021
Jun. 10, 2020
Feb. 14, 2020
Dec. 05, 2018
Nov. 18, 2015
Mar. 31, 2023
Mar. 31, 2022
Jun. 23, 2021
Mar. 14, 2018
May 18, 2017
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]                        
Number of Shares, Granted               857,500 13,161      
Unvested employee options outstanding               1,139,877 1,045,304      
Employee Stock Options                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Expense recognized               $ 177 $ 1,681      
Unamortized compensation expense share options               $ 1,615 $ 19,917      
Vesting period               2 years 9 months 18 days 3 years 2 months 26 days      
Restricted Share Units (RSUs)                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Expense recognized               $ 216 $ 214      
Unamortized stock compensation expense               $ 39 $ 1,130      
Stock-based compensation expense, expected weighted average period for recognition               3 months 18 days 1 year 11 months 15 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 9 months 14 days 3 years 1 month 28 days      
Unamortized compensation expense               $ 1,654 $ 21,047      
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 1,958      
2018 Plan | Restricted Share Units (RSUs) | Employees | Minimum                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Vesting period               2 years        
2018 Plan | Restricted Share Units (RSUs) | Employees | Maximum                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Vesting period               4 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                    
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        
Amended and Restated 2018 Equity Incentive Plan                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Number of shares, cancelled 906,800