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ORGANIZATION AND PRINCIPAL ACTIVITIES - Cash and Cash Equivalent of VIE's (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Financial information of VIEs and subsidiaries/schools        
Cash and cash equivalents $ 18,210 ¥ 118,821 ¥ 157,600 ¥ 211,436
China        
Financial information of VIEs and subsidiaries/schools        
Cash and cash equivalents   64,251 138,419  
Variable interest entities and subsidiaries of VIEs | China        
Financial information of VIEs and subsidiaries/schools        
Cash and cash equivalents   60,044 86,304  
Non-VIE | China        
Financial information of VIEs and subsidiaries/schools        
Cash and cash equivalents   ¥ 4,207 ¥ 52,115