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Related Party Transactions - Significant related party transactions (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Hangzhou Tuguan Technology Co., Ltd
Related Party Transactions
Services received from related party				¥ 102,995
Tencent Group
Related Party Transactions
Services received from related party	$ 184,185	¥ 1,266,362	¥ 516,014	54,286
Jiaxing Suda Electronic Commerce Co., Ltd
Related Party Transactions
Services received from related party				14,035
Toshare Group Holding Limited
Related Party Transactions
Services received from related party				7,824
Suzhou Lebei Network Technology Co., Ltd
Related Party Transactions
Services received from related party			¥ 2,444	4,127
Merchandise sold through related party				¥ 137,399

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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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