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Pre-Ipo Preferred Shares - Additional information (Detail)
1 Months Ended 12 Months Ended
Oct. 18, 2019
shares
Apr. 30, 2021
shares
Jul. 31, 2018
$ / shares
shares
Dec. 31, 2017
shares
Jul. 31, 2017
USD ($)
shares
Jun. 30, 2017
USD ($)
shares
Jan. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Feb. 28, 2014
USD ($)
shares
Mar. 31, 2012
USD ($)
shares
Mar. 31, 2011
USD ($)
shares
Dec. 31, 2021
USD ($)
Class of Stock [Line Items]                        
Stock issued, during the period   3,685,504                    
Minimum Pre-offering Valuation | $                       $ 400,000,000
IPO [Member]                        
Class of Stock [Line Items]                        
Minimum Pre-offering Valuation | $                       400,000,000
Proceeds From Conversion Of Preferred Stock | $                       40,000,000
Minimum [Member]                        
Class of Stock [Line Items]                        
Proceeds From Conversion Of Preferred Stock | $                       $ 70,000,000
Cyber Dreamer Limited [Member]                        
Class of Stock [Line Items]                        
Number Of Shares Transferred 17,597,981                      
Series A Convertible Redeemable Preferred Shares [Member]                        
Class of Stock [Line Items]                        
Proceeds from issuance of convertible preferred stock | $                     $ 1,000,000  
Stock Splits, shares issued during the period     100,000,000                  
Preferred stock, par value | $ / shares     $ 0.0001                  
Stock split, conversion ratio                       0.10
Series A Convertible Redeemable Preferred Shares [Member] | Matrix Partners China I Hong Kong Limited [Member]                        
Class of Stock [Line Items]                        
Stock issued, during the period                     10,000,000  
Series B Convertible Redeemable Preferred Shares [Member]                        
Class of Stock [Line Items]                        
Proceeds from issuance of convertible preferred stock | $                   $ 2,500,000    
Stock issued, during the period                   8,333,332    
Stock Splits, shares issued during the period     83,333,320                  
Preferred stock, par value | $ / shares     $ 0.0001                  
Stock split, conversion ratio                       0.10
Series B Convertible Redeemable Preferred Shares [Member] | Matrix Partners China I Hong Kong Limited [Member]                        
Class of Stock [Line Items]                        
Stock issued, during the period                   6,666,666    
Series B Convertible Redeemable Preferred Shares [Member] | Morning side China TMT Fund II LP [Member]                        
Class of Stock [Line Items]                        
Proceeds from issuance of convertible preferred stock | $                 $ 1,000,000      
Stock issued, during the period                   1,666,666    
Stock Splits, shares issued during the period     33,333,330                  
Preferred stock, par value | $ / shares     $ 0.0001                  
Stock split, conversion ratio                       0.10
Series B Convertible Redeemable Preferred Shares [Member] | Morning side China TMT Fund II LP [Member] | 2014 Loan [member]                        
Class of Stock [Line Items]                        
Stock issued, during the period                 3,333,333      
Series C Convertible Redeemable Preferred Shares [Member]                        
Class of Stock [Line Items]                        
Proceeds from issuance of convertible preferred stock | $               $ 10,894,477        
Stock issued, during the period               11,725,839        
Stock Splits, shares issued during the period     117,258,390                  
Preferred stock, par value | $ / shares     $ 0.0001                  
Stock split, conversion ratio                       0.10
Series C Convertible Redeemable Preferred Shares [Member] | 2014 Loan [member]                        
Class of Stock [Line Items]                        
Stock issued, during the period               2,532,494        
Stock Splits, shares issued during the period     25,324,940                  
Preferred stock, par value | $ / shares     $ 0.0001                  
Stock split, conversion ratio                       0.10
Series C Convertible Redeemable Preferred Shares [Member] | Matrix Partners China I Hong Kong Limited [Member]                        
Class of Stock [Line Items]                        
Stock issued, during the period               5,192,086        
Series C Convertible Redeemable Preferred Shares [Member] | Matrix Partners China I Hong Kong Limited [Member] | 2014 Loan [member]                        
Class of Stock [Line Items]                        
Stock issued, during the period               1,266,247        
Series C Convertible Redeemable Preferred Shares [Member] | Morning side China TMT Fund II LP [Member]                        
Class of Stock [Line Items]                        
Stock issued, during the period               6,533,753        
Series C Convertible Redeemable Preferred Shares [Member] | Morning side China TMT Fund II LP [Member] | 2014 Loan [member]                        
Class of Stock [Line Items]                        
Stock issued, during the period               1,266,247        
Series C1 Convertible Redeemable Preferred Shares [Member]                        
Class of Stock [Line Items]                        
Proceeds from issuance of convertible preferred stock | $             $ 3,223,675          
Stock issued, during the period             3,469,736          
Stock Splits, shares issued during the period     34,697,360                  
Preferred stock, par value | $ / shares     $ 0.0001                  
Stock split, conversion ratio                       0.10
Series C1 Convertible Redeemable Preferred Shares [Member] | People Better Limited [Member]                        
Class of Stock [Line Items]                        
Stock issued, during the period             1,734,868          
Series C1 Convertible Redeemable Preferred Shares [Member] | Shunwei Internet Limited [Member]                        
Class of Stock [Line Items]                        
Stock issued, during the period             1,734,868          
Series C1 Plus Convertible Redeemable Preferred Shares [Member]                        
Class of Stock [Line Items]                        
Stock issued, during the period       2,691,209                
Stock Splits, shares issued during the period     26,912,090                  
Preferred stock, par value | $ / shares     $ 0.0001                  
Stock split, conversion ratio                       0.10
Series D Convertible Redeemable Preferred Shares [Member]                        
Class of Stock [Line Items]                        
Preferred stock, par value | $ / shares     0.0001                  
Stock split, conversion ratio                       0.10
Series D Convertible Redeemable Preferred Shares [Member] | Cyber Dreamer Limited [Member]                        
Class of Stock [Line Items]                        
Proceeds from issuance of convertible preferred stock | $         $ 10,000,000 $ 22,000,000            
Stock issued, during the period         4,004,775 8,810,504            
Stock Splits, shares issued during the period         40,047,750 88,105,040            
Series D1 Convertible Redeemable Preferred Shares [Member]                        
Class of Stock [Line Items]                        
Preferred stock, par value | $ / shares     $ 0.0001                  
Stock split, conversion ratio                       0.10
Series D1 Convertible Redeemable Preferred Shares [Member] | Cyber Dreamer Limited [Member]                        
Class of Stock [Line Items]                        
Proceeds from issuance of convertible preferred stock | $         $ 5,000,000              
Stock issued, during the period         2,002,387              
Stock Splits, shares issued during the period         20,023,870