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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed balance sheets (Parenthetical) (Details) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Class A Ordinary Shares    
Condensed balance sheets    
Ordinary shares, par value (in dollars per share) $ 0.00001 $ 0.00001
Ordinary shares, shares authorized (in shares) 1,200,000,000 1,200,000,000
Ordinary shares, shares issued (in shares) 505,253,850 499,706,628
Ordinary shares, shares outstanding (in shares) 505,253,850 499,706,628
Class B Ordinary Shares    
Condensed balance sheets    
Ordinary shares, par value (in dollars per share) $ 0.00001 $ 0.00001
Ordinary shares, shares authorized (in shares) 300,000,000 300,000,000
Ordinary shares, shares issued (in shares) 174,649,638 174,649,638
Ordinary shares, shares outstanding (in shares) 174,649,638 174,649,638
Class C Ordinary Shares    
Condensed balance sheets    
Ordinary shares, par value (in dollars per share) $ 0.00001 $ 0.00001
Ordinary shares, shares authorized (in shares) 60,000 0
Ordinary shares, shares issued (in shares) 60,000 0
Ordinary shares, shares outstanding (in shares) 60,000 0
Parent Company | Class A Ordinary Shares    
Condensed balance sheets    
Ordinary shares, par value (in dollars per share) $ 0.00001  
Ordinary shares, shares authorized (in shares) 1,200,000,000 1,200,000,000
Ordinary shares, shares issued (in shares) 505,253,850 499,706,628
Ordinary shares, shares outstanding (in shares) 505,253,850 499,706,628
Parent Company | Class B Ordinary Shares    
Condensed balance sheets    
Ordinary shares, par value (in dollars per share) $ 0.00001  
Ordinary shares, shares authorized (in shares) 300,000,000 300,000,000
Ordinary shares, shares issued (in shares) 174,649,638 174,649,638
Ordinary shares, shares outstanding (in shares) 174,649,638 174,649,638
Parent Company | Class C Ordinary Shares    
Condensed balance sheets    
Ordinary shares, par value (in dollars per share) $ 0.00001  
Ordinary shares, shares authorized (in shares) 60,000 0
Ordinary shares, shares issued (in shares) 60,000 0
Ordinary shares, shares outstanding (in shares) 60,000 0