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Risks and Concentration | 12 Months Ended
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Dec. 31, 2023
Risks and Concentration |
Risks and Concentration | 3. Risks and Concentration (a) Concentration of Credit Risk Financial instruments that potentially subject the Group to concentration of credit risk consist of cash and cash equivalents, short-term investments, accounts receivable and notes receivable. The Group deposits its cash and cash equivalents and short-term investments with major financial institutions which the Group believes that no significant credit risk with high credit quality. The Group has not experienced any significant recoverability issue with respect to its accounts receivable. The Group assesses the creditworthiness of each customer when providing services and may require the customers to make advance payments or a deposit before the services are rendered. No individual customer accounted for more than 10% of accounts receivable as of December 31, 2022 and 2023. (b) Concentration of Customers and Suppliers There are no customers from whom revenues individually represent greater than 10% of the total revenues of the Group in any of the periods presented. Suppliers contributed more than 10% of total purchases are as below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31, | ​
​ |  | 2021 |  | 2022 |  | 2023 | ​
Supplier A |  | 25 | % | 15 | % | * | ​
Supplier B |  | * |  | * | ​ | 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 -Topic 275 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//275/tableOfContent + Details
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