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Property and Equipment, Net - Summary of Property and Equipment Consisted (Details) ¥ in Thousands, $ in Thousands		Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)
Property Plant And Equipment [Line Items]
Total cost		¥ 621,697		¥ 601,472
Less: Accumulated depreciation		(76,022)		(41,961)
Property and equipment, net		545,675	$ 78,381	559,511
Leasehold and Buildings Improvements
Property Plant And Equipment [Line Items]
Total cost		106,377		91,265
Electronic and Office Equipment
Property Plant And Equipment [Line Items]
Total cost		35,049		29,936
Buildings
Property Plant And Equipment [Line Items]
Total cost	[1]	¥ 480,271		¥ 480,271
[1] In 2017, the Group purchased two buildings in Wuhan (Building A and B) and one building in Guangzhou (Building C) with a total consideration of RMB480,271. RMB60,000 of the consideration was paid by a mortgage loan provided by a PRC bank in August 2018 (Note 12).

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