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Initial Public Offering - Additional Information (Detail)
$ / shares in Units, ¥ in Thousands, $ in Thousands
1 Months Ended 4 Months Ended 12 Months Ended
May 30, 2019
shares
Dec. 10, 2018
$ / shares
shares
Dec. 09, 2018
Vote
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2019
Vote
Mar. 31, 2021
Vote
shares
Mar. 31, 2019
shares
Mar. 31, 2020
$ / shares
Class of Stock [Line Items]                  
Initial public offering price per ADS sold to the public | $ / shares                 $ 0.10
Number of Class A ordinary shares each Class B ordinary share is convertible into             1    
American Depository Shares [Member]                  
Class of Stock [Line Items]                  
Number of Class A ordinary shares each Class B ordinary share is convertible into             1    
Class A Ordinary Shares                  
Class of Stock [Line Items]                  
Number of American Depositary Shares offered               120,872,750  
Number of ordinary shares represented by each ADS 25                
Number of votes each ordinary share is entitled | Vote             1    
Class A Ordinary Shares | American Depository Shares [Member]                  
Class of Stock [Line Items]                  
Number of votes each ordinary share is entitled | Vote             1    
Class B Ordinary Shares                  
Class of Stock [Line Items]                  
Number of votes each ordinary share is entitled | Vote     1     30      
Class B Ordinary Shares | American Depository Shares [Member]                  
Class of Stock [Line Items]                  
Number of votes each ordinary share is entitled | Vote             30    
IPO | American Depository Shares [Member]                  
Class of Stock [Line Items]                  
Number of American Depositary Shares offered       4,834,910 4,834,910        
Initial public offering price per ADS sold to the public | $ / shares         $ 14.00        
Number of ordinary shares represented by each ADS       25 25        
Net proceeds raised from the initial public offering after deducting underwriting discounts and commissions and other offering expenses       ¥ 389,356 $ 58,016        
IPO | Class A Ordinary Shares                  
Class of Stock [Line Items]                  
Number of American Depositary Shares offered   118,750,000              
Initial public offering price per ADS sold to the public | $ / shares   $ 0.56