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Financial Income, net | 12 Months Ended
--- | ---
Dec. 31, 2023
Financial Income, net. |
Financial Income, net | 13. Financial Income, net ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2021 |  | 2022 |  | 2023
​ | ​ | US$ | ​ | US$ | ​ | US$
Interest income and investment income, net (1) | ​ | 8,119 |  | 20,731 | ​ | 45,052
Realized gain of bridge loan conversion to investment | ​ | 1,218 | ​ | — | ​ | —
Fair value change of short-term investments | ​ | (1,998) | ​ | (2,056) | ​ | 54
Fair value change of long-term investments | ​ | (53) | ​ | (129) | ​ | (130)
Total financial income, net | ​ | 7,286 |  | 18,546 | ​ | 44,976
| (1) | Interest income and investment income, net included interest income and investment income of US$8,045, US$22,898 and US$49,744, as well as investment gain from forward exchange contracts of US$74, investment loss from forward exchange contracts of US$2,167 and US$4,692, for the years ended December 31, 2021, 2022 and 2023, respectively.

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- Definition The entire disclosure for interest and other income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 610 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//610/tableOfContent + Details
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