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ORGANIZATION AND BASIS OF PRESENTATION (Details)
12 Months Ended
Dec. 31, 2018
Investments in and advances to affiliates  
Concentration of net revenues (as a percent) 70.00%
Beijing RYB Technology Development Co., Ltd ("RYB Technology")  
Investments in and advances to affiliates  
Percentage of legal ownership by the Company 100.00%
QIYUAN Education Technology (Tianjin) Co., Ltd ("TJ Qiyuan")  
Investments in and advances to affiliates  
Percentage of legal ownership by the Company 100.00%
Beijing Beilin International Education Co., Ltd. ("BJ Beilin")  
Investments in and advances to affiliates  
Percentage of legal ownership by the Company 90.00%
Precious Companion Group Limited  
Investments in and advances to affiliates  
Percentage of legal ownership by the Company 100.00%
Digital Knowledge World Co., Ltd.  
Investments in and advances to affiliates  
Percentage of legal ownership by the Company 90.00%
Digital Education Co., Ltd.  
Investments in and advances to affiliates  
Percentage of legal ownership by the Company 90.00%
Beilin International Education Limited  
Investments in and advances to affiliates  
Percentage of legal ownership by the Company 90.00%