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Share-Based Compensation - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 17, 2021
Jun. 08, 2020
Oct. 12, 2018
Jan. 01, 2018
Mar. 31, 2017
Mar. 31, 2021
May 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Unrecognized compensation cost of options and RSUs           $ 33.6  
Expected to be recognized over a weighted average period           1 year 10 months 9 days  
Options | Tranche One              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Vesting percentage           33.00%  
Restricted Stock Units (RSUs)              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Awards vesting period           2 years  
Restricted Stock Units (RSUs) | Tranche One              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Vesting percentage           33.00%  
2017 Equity Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Maximum number of ordinary share issuable under the 2017 incentive plan         1,400,000 5,600,000  
Number of ordinary shares reserved for issuance, percentage           12.00%  
Increase in number of ordinary share issuable under the 2017 incentive plan 400,000 400,000 1,900,000 250,167      
Plan | Options              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Awards vesting period           3 years  
Combined voting power percentage           10.00%  
Ordinary Shares | 2019 Inducement Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of stock options approved for grants             900,000
Ordinary Shares | 2017 Equity Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Maximum number of ordinary share issuable under the 2017 incentive plan 4,350,167 3,950,167 3,550,167 1,650,167      
Maximum | Plan | Options              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Options granted, expected term           10 years  
Minimum | Plan | Options              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Exercise price of stock options as percentage of fair market value of shares on grant date           100.00%  
Stock options exercise price percentage for individuals possesses more than 10% of the combined voter power           110.00%