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REVENUE (Schedule of Revenue from contracts with customers) (Details)
¥ in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
CNY (¥)
Jun. 30, 2019
CNY (¥)
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with a customer | ¥   ¥ 6,867 ¥ 1,403
USD [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with a customer | $ $ 972