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NET REVENUE | 12 Months Ended
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Dec. 31, 2019
NET REVENUE |
NET REVENUE | 14. NET REVENUE Disaggregation of revenues All of the Group’s revenues for the years ended December 31, 2017, 2018 and 2019 were generated within the PRC. The following table illustrates the disaggregation of the Group’s revenue streams by type of customers and nature of services the Group offered:
|  | Year Ended December 31,
|  | 2017 |  | 2018 |  | 2019
Product Revenues |  | 949,217 |  | 1,770,227 |  | 3,929,698
B2C Business |  | 862,327 |  | 847,476 |  | 763,254
B2B Business |  | 86,890 |  | 922,751 |  | 3,166,444
Service Revenues |  | 10,269 |  | 15,743 |  | 22,355
MP Service |  | 8,767 |  | 12,375 |  | 17,239
Other Services |  | 1,502 |  | 3,368 |  | 5,116
Total |  | 959,486 |  | 1,785,970 |  | 3,952,053
Contract balance The typical contract term of MP service is no more than one year and the remaining unsatisfied performance obligation as of December 31, 2018 and 2019 was insignificant. In some arrangements from which product revenue is generated, the Group receives advance payments from consumers and pharmacy customers before the product is delivered, which is recorded as advance from customers included in the accrued expenses and other current liabilities on the consolidated balance sheet. The movements of the Group’s accounts receivable and advances from customers are as follows:
|  | Accounts |  | Advances from
|  | Receivable |  | Customers
Opening Balance as of January 1, 2018 |  | 20,398 |  | 11,722
Increase/(decrease), net |  | 8,171 |  | 3,767
Ending Balance as of December 31, 2018 |  | 28,569 |  | 15,489
Increase/(decrease), net |  | 36,678 |  | 47,967
Ending Balance as of December 31, 2019 |  | 65,247 |  | 63,456
Revenue amounted RMB11,722 and RMB15,489 were recognized in the years ended December 31, 2018 and 2019, respectively that were included in the balance of advance from customers at the beginning of the each year.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 + Details
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