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Share-Based Compensation (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 01, 2026
May 23, 2018
May 31, 2018
Dec. 31, 2025
Dec. 31, 2024
Share-Based Compensation          
Period of equal monthly vesting after first anniversary for options with six year vesting period       5 years  
Options          
Share-Based Compensation          
Shares outstanding (in shares)       9,420,208 11,286,994
Number of options granted       2,063,891  
RSUs, revenue PSUs, TSR PSUs, and share options          
Share-Based Compensation          
Total unrecognized compensation cost       $ 90,372  
Expenses expected to be recognized over a weighted average remaining period       2 years 6 months 7 days  
Development PSUs and PSOs          
Share-Based Compensation          
Total unrecognized compensation cost       $ 9,576  
Unvested PSUs          
Share-Based Compensation          
Service period       3 years  
2018 Plan | Class A ordinary shares          
Share-Based Compensation          
Total number of ordinary shares authorized to issue     4,466,500    
Percentage of automatic increase in shares available for issue 4.00%        
Additional shares authorized 3,051,742        
Number of ordinary shares available for future grant       5,621,352  
2018 Plan | Class A ordinary shares | Maximum          
Share-Based Compensation          
Percentage of automatic increase in shares available for issue     4.00%    
2015 Plan | Class A ordinary shares          
Share-Based Compensation          
Total number of ordinary shares authorized to issue   4,691,213      
Number of shares no longer available for future grant   92,170      
Shares outstanding (in shares)       618,561  
2015 Plan | Options          
Share-Based Compensation          
Voting power threshold percentage used to determine the exercise price for options       10.00%  
Vesting percentage of options having four year vesting term on the first anniversary of the grant date       25.00%  
Period of equal monthly vesting after first anniversary for options with four year vesting period       3 years  
Vesting percentage of options having six year vesting term on the first anniversary of the grant date       16.00%  
2015 Plan | Options | Minimum          
Share-Based Compensation          
Vesting period       4 years  
2015 Plan | Options | Maximum          
Share-Based Compensation          
Option term of incentive awards       10 years  
Option term of awards for the persons possessing more than 10% of voting power       5 years  
Vesting period       6 years  
2015 Plan | Options | Class A ordinary shares          
Share-Based Compensation          
Minimum percentage of exercise price of the fair market value of shares for the persons possessing 10% or less of voting power       100.00%  
Minimum percentage of exercise price of the fair market value of shares for the persons possessing more than 10% of voting power       110.00%  
2018 ESPP | Class A ordinary shares          
Share-Based Compensation          
Total number of ordinary shares authorized to issue     670,000    
Additional shares authorized 110,000        
Number of ordinary shares available for future grant       690,063  
2018 ESPP | Class A ordinary shares | Maximum          
Share-Based Compensation          
Percentage of automatic increase in shares available for issue   1.00%      
Maximum number of ordinary shares may be issued   6,420,000