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Condensed Financial Information of the Parent Company - Condensed Balance Sheets (Parenthetical) (Detail) - $ / shares
Dec. 31, 2021
Apr. 27, 2021
Dec. 31, 2020
Dec. 31, 2017
Nov. 29, 2017
Condensed Balance Sheet Statements, Captions [Line Items]          
Ordinary shares, par value         $ 0.0001
Ordinary shares, shares authorized       372,138,271  
Common Class A [Member]          
Condensed Balance Sheet Statements, Captions [Line Items]          
Ordinary shares, par value $ 0.0001   $ 0.0001    
Ordinary shares, shares authorized 420,674,280   420,674,280    
Ordinary shares, shares issued 229,831,213   227,831,213    
Ordinary shares, shares outstanding 206,506,455   224,771,083    
Common Class B [Member]          
Condensed Balance Sheet Statements, Captions [Line Items]          
Ordinary shares, par value $ 0.0001   $ 0.0001    
Ordinary shares, shares authorized 79,325,720   79,325,720    
Ordinary shares, shares issued 72,978,677 2,000,000 74,978,677    
Ordinary shares, shares outstanding 72,978,677   74,978,677    
Parent Company [Member] | Common Class A [Member]          
Condensed Balance Sheet Statements, Captions [Line Items]          
Ordinary shares, par value $ 0.0001   $ 0.0001    
Ordinary shares, shares authorized 420,674,280   420,674,280    
Ordinary shares, shares issued 229,831,213   227,831,213    
Ordinary shares, shares outstanding 206,506,455   224,771,083    
Parent Company [Member] | Common Class B [Member]          
Condensed Balance Sheet Statements, Captions [Line Items]          
Ordinary shares, par value $ 0.0001   $ 0.0001    
Ordinary shares, shares authorized 79,325,720   79,325,720    
Ordinary shares, shares issued 72,978,677   74,978,677    
Ordinary shares, shares outstanding 72,978,677   74,978,677