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ORDINARY SHARES (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Jan. 25, 2019
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
CNY (¥)
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2016
shares
Dec. 31, 2015
shares
Dec. 31, 2017
shares
Class of Stock [Line Items]                
Shares authorized (in shares)   1,000,000,000            
Dividends | $   $ 50            
Ordinary shares Class A                
Class of Stock [Line Items]                
Shares authorized (in shares)       800,000,000 800,000,000      
Common Stock, Par or Stated Value Per Share | $ / shares       $ 0.00005 $ 0.00005      
Ordinary shares, outstanding       92,120,024 91,088,106      
Common stock, shares, issued, not outstanding (in shares)       2,982,220        
Ordinary shares Class B                
Class of Stock [Line Items]                
Shares authorized (in shares)       72,000,000 72,000,000      
Common Stock, Par or Stated Value Per Share | $ / shares       $ 0.00005 $ 0.00005      
Ordinary shares, outstanding       72,000,000 72,000,000      
Ordinary shares Class C | Gold Prized                
Class of Stock [Line Items]                
Subscription receivable | ¥     ¥ 2,200          
Ordinary Shares | Ordinary shares Class A                
Class of Stock [Line Items]                
Shares authorized (in shares)   800,000,000           72,000,000
Common Stock, Par or Stated Value Per Share | $ / shares   $ 0.00005            
Shares issued 5,500,000 15,969,110     15,969,110      
Ordinary shares issued       2,517,780        
Ordinary shares, outstanding       92,120,024 91,088,106 72,000,000   72,000,000
Conversion of preferred shares into Class A ordinary shares upon IPO (in shares)   75,118,996     75,118,996      
Issuance of ordinary shares upon initial public offering ("IPO"), net of issuance costs of RMB19,134 (in shares) 5,500,000 15,969,110     15,969,110      
Re-designation of Class A ordinary shares into Class B ordinary shares (Note 13) (in shares)   72,000,000     (72,000,000)      
Ordinary Shares | Ordinary shares Class B                
Class of Stock [Line Items]                
Shares authorized (in shares)   72,000,000           839,209,895
Common Stock, Par or Stated Value Per Share | $ / shares   $ 0.00005            
Ordinary shares, outstanding       72,000,000 72,000,000      
Re-designation of Class A ordinary shares into Class B ordinary shares (Note 13) (in shares)         72,000,000      
Ordinary Shares | Ordinary shares Class C                
Class of Stock [Line Items]                
Shares authorized (in shares)   128,000,000           13,671,109
Common Stock, Par or Stated Value Per Share | $ / shares   $ 0.00005            
Ordinary Shares | Ordinary shares Class C | Gold Prized                
Class of Stock [Line Items]                
Shares issued           1,607,901 1,607,901  
Issuance of ordinary shares upon initial public offering ("IPO"), net of issuance costs of RMB19,134 (in shares)           1,607,901 1,607,901  
Number of Surrendered Shares     1,607,901          
Equity Incentive Plan | Ordinary shares Class A                
Class of Stock [Line Items]                
Ordinary shares issued       2,517,780        
Ordinary shares, outstanding       2,517,780