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ADDITIONAL INFORMATION-CONDENSED FINANCIAL STATEMENTS OF THE PARENT COMPANY (Condensed Balance Sheets - Parenthetical) (Details) - $ / shares
Dec. 31, 2019
May 31, 2019
Dec. 31, 2018
Feb. 28, 2018
Condensed Financial Statements, Captions [Line Items]        
Ordinary shares, par value $ 0.00002 $ 0.00002 $ 0.00002 $ 0.00002
Ordinary shares, shares authorized 500,000,000   500,000,000  
Ordinary shares, shares issued 180,653,497   158,587,937  
Ordinary shares, shares outstanding 178,930,297   156,864,737  
Treasury stock at cost, shares 1,723,200   1,723,200  
Parent Company [Member] | Reportable Legal Entities [Member]        
Condensed Financial Statements, Captions [Line Items]        
Ordinary shares, par value $ 0.00002   $ 0.00002  
Ordinary shares, shares authorized 500,000,000   500,000,000  
Ordinary shares, shares issued 180,653,497   133,869,274  
Ordinary shares, shares outstanding 178,930,297   156,864,737  
Treasury stock at cost, shares 1,723,200   1,723,200