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Concentrations and Risks (Tables) | 12 Months Ended
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Dec. 31, 2024
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] |
Concentrations and Risks |
Summary of concentration of risk | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | For the year ended | ​
​ |  | December 31, | ​
Revenues |  | 2022 |  | 2023 |  | 2024 | ​
Customer A |  | 17 | % | 10 | % | * | ​
Customer C | ​ | 12 | % | 19 | % | 22 | %
Customer D |  | * | ​ | * | ​ | 12 | %
Accounts Receivable [Member] | Customer Concentration Risk [Member] |
Concentrations and Risks |
Summary of concentration of risk | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | As of | ​
​ |  | December 31, | ​
Accounts receivable |  | 2023 |  | 2024 |
Customer B | ​ | 35 | % | 10 | %
Customer C | ​ | 23 | % | 26 | %
Customer D | ​ | * | ​ | 14 | %
Cash & cash equivalents, restricted cash and short-term investments | Credit Risk [Member] |
Concentrations and Risks |
Summary of concentration of risk | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended |
​ | ​ | December 31 |
Cash & cash equivalents, restricted cash and short-term investments |  | 2023 |  | 2024 |
Bank E |  | 77 | % | 84 | %
Bank F |  | 23 | % | 15 | %

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