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Revenues (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenues |
Schedule of revenues | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ |  | 2017 |  | 2018 |  | 2019 | ​ | 2019
​ |  | RMB | ​ | RMB |  | RMB |  | US$
Online marketplace services | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Online marketing services |  | 1,209,275 | ​ | 11,515,575 |  | 26,813,641 |  | 3,851,539
Transaction services |  | 531,416 | ​ | 1,604,415 |  | 3,328,245 |  | 478,072
Merchandise sales |  | 3,385 | ​ | — |  | — |  | —
​ |  | 1,744,076 | ​ | 13,119,990 |  | 30,141,886 |  | 4,329,611
Schedule of information about contract liabilities, comprising customer advances, deferred revenues and portions of Payables to merchants | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | December 31, 2018 | ​ | December 31, 2019 | ​ | December 31, 2019
​ |  | RMB |  | RMB |  | US$
Customer advances and deferred revenues |  | 191,482 |  | 605,970 |  | 87,042
Payable to merchants |  | 72,939 | ​ | 116,557 | ​ | 16,742

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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