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Leases - Other supplemental (Details) - 12 months ended Dec. 31, 2019
¥ in Thousands, $ in Thousands
USD ($)
CNY (¥)
Leases    
Operating cash flows for operating leases $ 10,935 ¥ 76,130
ROU assets obtained in exchange for new operating lease liabilities $ 57,836 ¥ 402,646