XML 79 R94.htm IDEA: XBRL DOCUMENT v3.20.1
Redeemable Convertible Preferred Shares - Additional Information (Detail)
$ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Oct. 20, 2017
$ / shares
shares
Feb. 09, 2015
USD ($)
$ / shares
shares
Feb. 13, 2014
USD ($)
$ / shares
shares
Sep. 13, 2012
USD ($)
$ / shares
shares
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Dec. 31, 2017
$ / shares
Jun. 30, 2012
$ / shares
Temporary Equity [Line Items]                      
Convertible redeemable preferred shares, issued, price per share | $ / shares               $ 0.5300 $ 0.7200 $ 1.422  
Share split, description         Each of ordinary share and preferred share of the Company was subdivided into 100 shares at a par value of US$0.00001            
Preferred stock shares converted and designated 100                    
Ordinary shares, par value | $ / shares $ 0.00001             $ 0.00001     $ 0.00001
Preferred shares, par value | $ / shares $ 0.00001                    
Preferred shares accretion recognized | ¥         ¥ 0 ¥ 0 ¥ 3,073,471        
Series A Convertible Redeemable Preferred Shares [Member]                      
Temporary Equity [Line Items]                      
Convertible redeemable preferred shares, issued | shares       2,850,000              
Proceeds from issuance of convertible redeemable preferred shares | $       $ 4,560              
Convertible redeemable preferred shares, issued, price per share | $ / shares       $ 1.60              
Convertible redeemable preferred shares, outstanding | shares 285,000,000                    
Series B Convertible Redeemable Preferred Shares [Member]                      
Temporary Equity [Line Items]                      
Convertible redeemable preferred shares, issued | shares     2,142,857                
Proceeds from issuance of convertible redeemable preferred shares | $     $ 15,000                
Convertible redeemable preferred shares, issued, price per share | $ / shares     $ 7.00                
Convertible redeemable preferred shares, outstanding | shares 214,285,700                    
Series C Convertible Redeemable Preferred Shares [Member]                      
Temporary Equity [Line Items]                      
Convertible redeemable preferred shares, issued | shares   2,345,547                  
Proceeds from issuance of convertible redeemable preferred shares | $   $ 46,667                  
Convertible redeemable preferred shares, issued, price per share | $ / shares   $ 19.90                  
Convertible redeemable preferred shares, outstanding | shares 234,554,700