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Ordinary Shares - Activities of the Group's Class A ordinary shares and Class B ordinary shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 15, 2023
Mar. 28, 2023
Oct. 18, 2021
Sep. 13, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Nov. 01, 2022
Dec. 31, 2020
Dec. 31, 2019
Aug. 28, 2014
Ordinary Shares                      
Beginning Balance         $ 962,167 $ 1,113,661 $ (164,667)        
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance             904,732        
Cancellation of Treasury stock (in shares) 1,200,794 2,753,167                  
Ending Balance         $ 970,565 $ 962,167 $ 1,113,661        
Ordinary shares, par value         $ 0.00005 $ 0.00005 $ 0.00005   $ 0.00005 $ 0.00005 $ 0.00005
Common Stock                      
Ordinary Shares                      
Beginning Balance (in shares)         578,546,560 571,246,560 221,980,000        
Beginning Balance         $ 29 $ 29 $ 11        
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance (in shares)             45,076,479        
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance             $ 2        
Cancellation of Treasury stock (in shares)         (3,953,961)            
Issuance of ordinary shares reserved for equity incentive plan (in shares)             10,000,000        
Issuance of ordinary shares reserved for equity incentive plan             $ 1        
Ending Balance (in shares)         574,592,599 578,546,560 571,246,560        
Ending Balance         $ 29 $ 29 $ 29        
Common Class A                      
Ordinary Shares                      
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance (in shares)     5,000,000 5,000,000              
Ordinary shares, par value         $ 0.00005 $ 0.00005   $ 0.00005      
Common Class A | Common Stock                      
Ordinary Shares                      
Beginning Balance (in shares)         499,146,560 491,846,560          
Beginning Balance         $ 25 $ 25          
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance (in shares)           7,300,000          
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance           $ 0          
Cancellation of Treasury stock (in shares)         (3,953,961)            
Conversion of Class B ordinary shares to Class A ordinary shares         9,194,700            
Ending Balance (in shares)         504,387,299 499,146,560 491,846,560        
Ending Balance         $ 25 $ 25 $ 25        
Common Class B                      
Ordinary Shares                      
Ordinary shares, par value         $ 0.00005 $ 0.00005          
Common Class B | Common Stock                      
Ordinary Shares                      
Beginning Balance (in shares)         79,400,000 79,400,000          
Beginning Balance         $ 4 $ 4          
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance (in shares)           0          
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance           $ 0          
Cancellation of Treasury stock (in shares)         0            
Conversion of Class B ordinary shares to Class A ordinary shares         (9,194,700)            
Ending Balance (in shares)         70,205,300 79,400,000 79,400,000        
Ending Balance         $ 4 $ 4 $ 4        
Total of Class A ordinary shares and Class B ordinary shares [Member] | Common Stock                      
Ordinary Shares                      
Beginning Balance (in shares)         578,546,560 571,246,560          
Beginning Balance         $ 29 $ 29          
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance (in shares)           7,300,000          
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance           $ 0          
Cancellation of Treasury stock (in shares)         (3,953,961)            
Ending Balance (in shares)         574,592,599 578,546,560 571,246,560        
Ending Balance         $ 29 $ 29 $ 29