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Risks and Concentration (Tables) | 12 Months Ended
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Dec. 31, 2023
Risks and Concentration |
Summary of customers with greater than 10% of the accounts receivable and suppliers contributed more than 10% of total purchases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31, | ​
​ |  | 2021 |  | 2022 |  | 2023 | ​
Supplier A |  | 25 | % | 15 | % | * | ​
Supplier B |  | * |  | * | ​ | 11 | %
​

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