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LEASE (Other information) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Lease    
Operating cash flows from operating leases $ 2,656 ¥ 18,491
ROU assets obtained in exchange for new operating liabilities lease $ 33,743 ¥ 234,915
Weighted-average remaining lease term (in years) 4 years 4 years
Weighted-average discount rate 4.87% 4.87%