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Concentrations and Risks (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Revenues | Customer risk |
Concentrations and Risks |
Summary of concentration of risk | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | For the year ended | ​
​ |  | December 31, | ​
Revenues |  | 2021 |  | 2022 |  | 2023 | ​
Customer A |  | * | ​ | 17 | % | 10 | %
Customer C |  | * | ​ | 12 | % | 19 | %
Accounts receivable | Customer risk |
Concentrations and Risks |
Summary of concentration of risk | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | For the year ended | ​
​ |  | December 31, | ​
Accounts receivable |  | 2022 |  | 2023 |
Customer B | ​ | 67 | % | 35 | %
Customer C | ​ | 8 | % | 23 | %
Cash & cash equivalents, restricted cash and short-term investments | Credit risk |
Concentrations and Risks |
Summary of concentration of risk | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended |
​ | ​ | December, 31 |
Cash & cash equivalents, restricted cash and short-term investments |  | 2022 |  | 2023 |
Bank E |  | 74 | % | 77 | %
Bank F |  | 25 | % | 23 | %

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