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Share-based Compensation - General (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 25, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Feb. 21, 2021 | Dec. 31, 2020 | Jul. 31, 2020 | Dec. 31, 2014
Share-based Compensation |  |  |  |  |  |  |  |
Number of options granted |  | 0 | 2,765,000 | 18,035,000 |  |  |  |
Requisite service period |  | 4 years | 4 years | 4 years |  |  |  |
Number of options outstanding |  | 51,672,005 | 56,274,213 | 59,961,539 |  | 48,740,000 |  |
2015 Plan |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |
Number of ordinary shares reserved for issuance |  |  |  |  | 76,778,005 |  | 60,778,005 | 31,918,690
Contractual term |  | 10 years |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |  |
Total incremental share-based compensation expense |  | $ 728 | $ 1,646 |  |  |  |  |
Expenses expected to be amortized over the remaining requisite service period |  | $ 154,000 |  |  |  |  |  |
Percentage of issued and outstanding stock of the entity considered for annual incremental in total number of shares available for issuance | 2.00% |  |  |  |  |  |  |
Number of options granted |  | 1,181,000 | 10,205,500 | 3,217,000 |  |  |  |
Number of options outstanding |  | 51,672,005 | 56,274,213 |  |  |  |  |
2015 Plan | Minimum |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |
Requisite service period |  | 3 years |  |  |  |  |  |
2015 Plan | Maximum |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |
Requisite service period |  | 4 years |  |  |  |  |  |
2015 Plan | Restricted Share Units (RSUs) |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |
Number of options granted |  | 9,323,125 | 11,638,750 |  |  |  |  |
2015 Plan | Share-based payment arrangement, tranche one |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |
Vesting period |  | 2 years |  |  |  |  |  |
Vesting percentage |  | 50.00% |  |  |  |  |  |
2015 Plan | Share-based payment arrangement, tranche two |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |
Vesting period |  | 2 years |  |  |  |  |  |
Vesting percentage |  | 50.00% |  |  |  |  |  |

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