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LONG-TERM BORROWING (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
May 01, 2020
USD ($)
May 01, 2020
CNY (¥)
Debt Instrument [Line Items]        
Long-term borrowing $ 1,470 ¥ 9,594    
PPP loan        
Debt Instrument [Line Items]        
Long-term borrowing     $ 1,470  
Interest rate (as a percent)     1.00% 1.00%
Bay State College Inc        
Debt Instrument [Line Items]        
Long-term borrowing     $ 1,470 ¥ 9,594
Interest rate (as a percent)     1.00% 1.00%