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Concentrations and Risks (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenues | Customer risk |
Concentration Risk [Line Items] |
Summary of concentration of risk |
|  | For the year ended
|  | December 31,
Revenues |  | 2017 |  | 2018 |  | 2019
Customer A |  | 11 | % | 19 | % | * |
Customer B |  | 11 | % | — |  | — |
Customer D |  | — |  | — |  | 31 | %
* Less than 10%
Accounts receivable | Customer risk |
Concentration Risk [Line Items] |
Summary of concentration of risk |
|  | As of |
|  | December 31, |
Accounts receivable |  | 2018 |  | 2019 |
Customer A |  | 30 | % | 11 | %
Customer D |  | — |  | 35 | %
Costs and expenses | Supplier risk |
Concentration Risk [Line Items] |
Summary of concentration of risk |
|  | For the year ended
|  | December 31,
Costs and expenses |  | 2017 |  | 2018 |  | 2019
Supplier IV |  | — |  | — |  | 27 | %
Accounts payable | Supplier risk |
Concentration Risk [Line Items] |
Summary of concentration of risk |
|  | As of |
|  | December 31, |
Accounts payable |  | 2018 |  | 2019 |
Supplier I |  | 16 | % | * |
Supplier IV |  | — |  | 57 | %
* Less than 10%

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