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Other Non-Current Assets - Summary of Other Non-Current Assets (Parenthetical) (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Nov. 30, 2018
Other Non Current Assets [Line Items]      
Prepayment to acquire a building [1] ¥ 404,725 ¥ 404,725  
Mortgage Loan | PRC Bank      
Other Non Current Assets [Line Items]      
Prepayment to acquire a building     ¥ 200,000
[1] The amount represented the prepayment for a building (Building D) in Wuhan and the building remained under construction by the real estate developer as of December 31, 2019. RMB200,000 of the prepayment was made through a mortgage loan provided by a PRC bank in November 2018 (Note 12).