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Concentrations and Risks | 12 Months Ended
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Dec. 31, 2020
Risks and Uncertainties [Abstract] |
Concentrations and Risks |
3. | Concentrations and Risks
a) | Telecommunications service provider
The Group relied on telecommunications service providers and their affiliates for servers and bandwidth services to support its operations for the years ended December 31, 2018, 2019 and 2020 as follows:
|  | For the Year Ended December 31, |
|  | 2018 |  |  | 2019 |  |  | 2020 |
Total number of telecommunications service providers |  |  | 88 |  |  |  | 107 |  |  |  | 116 |
Number of service providers providing 10% or more of the Group’s servers and bandwidth expenditure |  |  | 3 |  |  |  | 2 |  |  |  | 3 |
Total percentage of the Group’s servers and bandwidth expenditure provided by 10% or greater service providers |  |  | 48 | % |  |  | 45 | % |  |  | 55 | %
b) | Foreign currency exchange rate risk
The functional currency and the reporting currency of the Company are U.S. dollars and RMB, respectively. The Group’s exposure to foreign currency exchange rate risk primarily relates to cash and cash equivalents, time deposits, short-term and long-term investments, long-term debt and accounts payable denominated in the U.S. dollars. Most of the Group’s revenues, costs and expenses are denominated in RMB, while the long-term debt and a portion of cash and cash equivalents, time deposits, short-term and long-term investments, and accounts payable are denominated in U.S. dollars. Any significant fluctuation of RMB against U.S. dollars may materially and adversely affect the Company’s cash flows, revenues, earnings and financial positions.
c) | Credit risk
The Group’s financial instruments potentially subject to significant concentrations of credit risk primarily consist of cash and cash equivalents, time deposits, accounts receivable, and money market funds and financial products with variable interest rates referenced to performance of underlying assets issued by commercial banks and other financial institutions. As of December 31, 2018, 2019 and 2020, substantially all of the Group’s cash and cash equivalents and time deposits were held in major financial institutions located in the United States of America and China, which management consider being of high credit quality. Accounts receivable is typically unsecured and is primarily derived from revenue earned from mobile game services (mainly relates to remittances due from payment channels and distribution channels) and advertising services. There was no individual payment channel that had receivable balance exceeding 10% of the Group’s accounts receivable balance as of December 31, 2018, 2019 and 2020. One distribution channel had receivable balance exceeding 10% of the Group’s accounts receivable balance as of December 31, 2018, 2019 and 2020, respectively, as follows:
RMB in thousands |  | December 31, 2018 |  |  | December 31, 2019 |  |  | December 31, 2020 |
Distribution channel A |  |  | 63,762 |  |  |  | 118,860 |  |  |  | 146,907 |
d) | Major customers and supplying channels
No single customer represented 10% or more of the Group’s net revenues for the years ended December 31, 2018, 2019 and 2020. The Group relied on a distribution channel to publish and generate the iOS version of its mobile games. Mobile game revenues generated through this distribution channel accounted for approximately 29%, 17% and 11% of the Group’s total net revenues for the years ended December 31, 2018, 2019 and 2020, respectively.
e) | Mobile games
Mobile game revenues accounted for 71%, 53% and 40% of the Group’s total net revenues for the years ended December 31, 2018, 2019 and 2020, respectively. One mobile game individually contributing more than 10% of the Group’s total net revenues for the years ended December 31, 2018, 2019 and 2020, as follows:
|  | For the Year Ended December 31, |
|  | 2018 |  |  | 2019 |  |  | 2020 |
Mobile game 1 |  |  | 53 | % |  |  | 31 | % |  |  | 11 | %

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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