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Principal Accounting Policies - Summary of Supplemental Cash Flow Information Related to Operating Leases (Details) - 12 months ended Dec. 31, 2019
¥ in Thousands, $ in Thousands
CNY (¥)
USD ($)
Accounting Policies [Abstract]    
Cash payments for operating leases ¥ 37,713 $ 5,417
Right-of-use assets obtained in exchange for operating lease liabilities ¥ 22,388 $ 3,216