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Convertible Preferred Shares and Redeemable Convertible Preferred Shares - Additional Information (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Jan. 08, 2020
USD ($)
shares
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Jan. 01, 2020
shares
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items]        
Proceeds from redeemable convertible preferred stock | ¥   ¥ 124,730 ¥ 349,395  
Series A Convertible Preferred Shares [Member]        
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items]        
Preferred stock, shares issued       458,116,000
Preferred stock, shares outstanding       458,116,000
Series B Convertible Preferred Shares [Member]        
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items]        
Temporary equity, shares issued       153,603,600
Temporary equity, shares outstanding       153,603,600
Series C Convertible Preferred Shares [Member]        
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items]        
Temporary equity, shares issued       185,665,192
Temporary equity, shares outstanding       185,665,192
Series D Convertible Preferred Shares [Member]        
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items]        
Temporary equity, shares issued       842,738,782
Temporary equity, shares outstanding       842,738,782
Series D+ Convertible Preferred Shares [Member]        
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items]        
Temporary equity, shares issued       55,089,998
Temporary equity, shares outstanding       55,089,998
Proceeds from redeemable convertible preferred stock | $ $ 20,000      
Temporary equity shares issued during the period shares 22,035,999