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v3.20.1

NET REVENUE - Contract balance (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Accounts Receivable |  |  |  |
Opening Balance |  | ¥ 28,569 | ¥ 20,398 |
Increase/(decrease), net | $ 5,268 | 36,678 | 8,171 | ¥ (7,990)
Ending Balance | $ 9,372 | 65,247 | 28,569 | 20,398
Advances from Customers |  |  |  |
Opening Balance |  | 15,489 | 11,722 |
Increase/(decrease), net |  | 47,967 | 3,767 |
Ending Balance |  | ¥ 63,456 | ¥ 15,489 | ¥ 11,722
MP Service |  |  |  |
Contract balance |  |  |  |
Maximum term of contract with customer | 1 year | 1 year | 1 year |

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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