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Significant Equity Transactions and Acquisitions - Additional Information (Detail)
¥ in Millions
1 Months Ended 12 Months Ended
Nov. 10, 2017
CNY (¥)
Founders
shares
Oct. 31, 2017
CNY (¥)
Aug. 31, 2017
CNY (¥)
Dec. 31, 2017
Nov. 10, 2017
$ / shares
Jun. 30, 2012
shares
Significant Equity Transactions And Acquisitions [Line Items]            
Common stock shares redesignated           4,000,000
HB Micro Lending Company [Member]            
Significant Equity Transactions And Acquisitions [Line Items]            
Percentage of voting rights       60.00%    
Acquisition date       Oct. 31, 2017    
American Depositary Shares [Member]            
Significant Equity Transactions And Acquisitions [Line Items]            
Net proceeds from initial public offering and private placement | ¥ ¥ 253.0          
Share Purchase Agreement [Member] | HB Micro Lending Company [Member]            
Significant Equity Transactions And Acquisitions [Line Items]            
Percentage of common shares acquired     32.00%      
Cash consideration | ¥     ¥ 48.2      
Equity Pledge Agreement [Member] | HB Micro Lending Company [Member]            
Significant Equity Transactions And Acquisitions [Line Items]            
Percentage of common shares acquired   28.00%        
Cash consideration | ¥   ¥ 42.0        
Gf Sino Vest Fund Spc Star Six SP [Member]            
Significant Equity Transactions And Acquisitions [Line Items]            
Common stock shares redesignated           4,000,000
Number of founders | Founders 4          
IPO [Member] | American Depositary Shares [Member]            
Significant Equity Transactions And Acquisitions [Line Items]            
Number of shares offered 17,000,000          
Number of ordinary shares represented by each ADS         5  
Share price | $ / shares         $ 13.00  
Private Placement [Member] | American Depositary Shares [Member]            
Significant Equity Transactions And Acquisitions [Line Items]            
Number of shares offered 3,846,154