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Short-term Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
Short-term Investments |
Summary of short term investments | ​
​ | ​ | ​ | ​ | ​
​ |  | As of December 31,
​ |  | 2022 |  | 2023
​ |  | US$ |  | US$
Time deposits | ​ | 818,885 | ​ | 288,758
Equity securities with readily determinable fair value (1) |  | 2,249 |  | 2,265
Total short-term investments |  | 821,134 |  | 291,023
| (1) | Starting from July 2021, the Group, from time to time, invested in ordinary shares of a listed company and disposed of portion of the investments. For the years ended December 31, 2021, 2022 and 2023, the Group recorded fair value losses on short-term equity investment of US$1,998, US$2,056 and gains of US$54, respectively, in financial income, net in the consolidated statements of comprehensive loss. This investment is classified as equity securities with readily determinable fair values.

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- Definition Tabular disclosure of investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 321 -Publisher FASB -URI https://asc.fasb.org//321/tableOfContent Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 325 -Publisher FASB -URI https://asc.fasb.org//325/tableOfContent + Details
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