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Share-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
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Jun. 23, 2021 | Jun. 10, 2020 | Feb. 14, 2020 | Dec. 31, 2018 | Dec. 05, 2018 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Mar. 14, 2018 | May 18, 2017 | Nov. 18, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share options granted |  |  |  |  |  |  |  | 13,621,412 |  |  |  |
Employee Stock Options |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unvested employee options outstanding |  |  |  |  |  | 13,732,567 | 420,783 | 13,732,567 | 420,783 |  |  |
Expense recognized |  |  |  |  |  | $ 1,663 | $ 259 | $ 2,104 | $ 922 |  |  |
Unamortized compensation expense share options |  |  |  |  |  | 22,385 | 1,722 | $ 22,385 | $ 1,722 |  |  |
Vesting period |  |  |  |  |  |  |  | 3 years 8 months 4 days | 1 year 9 months 21 days |  |  |
Restricted Share Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expense recognized |  |  |  |  |  | 304 | 1 | $ 668 | $ 63 |  |  |
Number of shares, granted/awarded |  |  |  |  |  |  |  | 1,345,328 |  |  |  |
Unamortized stock compensation expense |  |  |  |  |  | 1,467 |  | $ 1,467 |  |  |  |
Stock-based compensation expense, expected weighted average period for recognition |  |  |  |  |  |  |  | 1 year 4 months 6 days |  |  |  |
Restricted Share Units (RSUs) | Employees and Directors |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, granted/awarded |  |  |  |  |  |  |  | 1,345,328 | 0 |  |  |
Restricted Share Units (RSUs) | Director |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |  |
Restricted Share Units (RSUs) | Employees |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 2 years |  |  |  |
Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expense recognized |  |  |  |  |  | 455 | 590 | $ 420 | $ 1,648 |  |  |
Number of shares, granted/awarded |  |  |  |  |  |  |  | 0 | 1,079,000 |  |  |
Unamortized stock compensation expense |  |  |  |  |  |  | 381 |  | $ 381 |  |  |
Stock-based compensation expense, expected weighted average period for recognition |  |  |  |  |  |  |  |  | 5 months 1 day |  |  |
Options and Restricted Share Units and Performance Restricted Share Units |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 3 years 6 months 29 days | 7 months 24 days |  |  |
Unamortized compensation expense |  |  |  |  |  | $ 23,852 | $ 2,103 | $ 23,852 | $ 2,103 |  |  |
2015 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  |  |  |  |  | 223,424
Number of ordinary shares available for issuance |  |  |  |  |  |  |  |  |  |  | 443,029 | 219,605
2018 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  |  |  | 1,018,459 |  |
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 | 15,000,000 | 2,250,000 | 594,758 | 574,081 |  |  |  |  |  |  |  |
2018 Plan | Employees and Directors |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share options granted |  |  |  |  |  |  |  | 13,621,412 | 64,840 |  |  |

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