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ORGANIZATION AND PRINCIPAL ACTIVITIES - Additional Information (Detail)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
May 10, 2019
CNY (¥)
shares
Dec. 31, 2015
CNY (¥)
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
May 10, 2019
$ / shares
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2018
$ / shares
Summary of Organization and Principal Activities [Line Items]              
Contractual consideration net of funds remaining in the investor assurance program     ¥ 130,722 $ 18,777      
Guarantee liability | ¥           ¥ 4,060  
Shares par value | $ / shares       $ 0.000000005      
Common shares, shares issued (in shares) | shares     216,100,000 216,100,000      
Stock issued equivalent common stock shares | shares 16,100,000            
IPO Expenses Capitalization | ¥ ¥ 234,354            
American Depositary Share [Member]              
Summary of Organization and Principal Activities [Line Items]              
Shares issued in initial public offering ("IPO") (in shares) | shares 4,025,000            
Shares issued, price per share | $ / shares         $ 10.50    
Common Class A [Member]              
Summary of Organization and Principal Activities [Line Items]              
Shares par value | $ / shares       $ 0.000000005     $ 0.000000005
Common shares, shares issued (in shares) | shares     100,100,000 100,100,000   84,000,000  
Shares issued in initial public offering ("IPO") (in shares) | shares     16,100,000        
Common Class B [Member]              
Summary of Organization and Principal Activities [Line Items]              
Shares par value | $ / shares       $ 0.000000005     $ 0.000000005
Common shares, shares issued (in shares) | shares     116,000,000 116,000,000   116,000,000  
Shanghai Niwodai Finance Information Co., Ltd. ("Niwodai Finance")              
Summary of Organization and Principal Activities [Line Items]              
Investor assurance fund | ¥   ¥ 136,300          
Shanghai Caiyin Asset Management Co., Ltd. ("Shanghai Caiyin")              
Summary of Organization and Principal Activities [Line Items]              
Total consideration | ¥   700,000          
Guarantee liability | ¥     ¥ 2,900,000        
Shanghai Caiyin Asset Management Co., Ltd. ("Shanghai Caiyin") | Shanghai Niwodai Finance Information Co., Ltd. ("Niwodai Finance")              
Summary of Organization and Principal Activities [Line Items]              
Contractual consideration net of funds remaining in the investor assurance program | ¥   ¥ 563,700