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Ordinary Shares - Additional Information (Detail)
Sep. 14, 2020
shares
Aug. 14, 2019
shares
Jun. 26, 2019
shares
Aug. 06, 2018
shares
Jul. 30, 2018
shares
Jul. 26, 2018
Vote
shares
Nov. 29, 2017
$ / shares
shares
Oct. 09, 2017
shares
Dec. 31, 2021
$ / shares
shares
Apr. 27, 2021
shares
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2017
shares
Common Equity [Line Items]                        
Shares issued             124,969,987 124,969,987        
Par value | $ / shares             $ 0.0001          
Shares authorized                       372,138,271
Common Class A [Member]                        
Common Equity [Line Items]                        
Shares issued       600,000 8,000,000              
Par value | $ / shares                 $ 0.0001   $ 0.0001  
Shares authorized                 420,674,280   420,674,280  
Shares issued 2,000,000 1,737,238 609,805     169,239,905            
Ordinary shares, outstanding                 206,506,455   224,771,083  
Ordinary shares, shares issued                 229,831,213   227,831,213  
Common Class B [Member]                        
Common Equity [Line Items]                        
Par value | $ / shares                 $ 0.0001   $ 0.0001  
Shares authorized                 79,325,720   79,325,720  
Ordinary shares, vote per share | Vote           20            
Ordinary shares, outstanding                 72,978,677   74,978,677  
Ordinary shares, shares issued                 72,978,677 2,000,000 74,978,677  
American Depositary Shares [Member]                        
Common Equity [Line Items]                        
Shares issued       300,000 4,000,000