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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%