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Principal Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Principal Accounting Policies |
Schedule of assets and liabilities that are measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Fair value measurement at reporting date using
​ |  | Fair value |  | Quoted Prices in Active |  | ​ |  | Significant
​ | ​ | as of | ​ | Markets for Identical | ​ | Significant Other | ​ | Unobservable
​ | ​ | December 31, | ​ | Assets | ​ | Observable Inputs | ​ | Inputs
Description |  | 2022 |  | (Level 1) |  | (Level 2) |  | (Level 3)
​ | ​ | US$ | ​ | US$ | ​ | US$ | ​ | US$
Assets: |  |  |  |  |  |  |  |
Short-term investments |  | 821,134 |  | 2,249 |  | 818,885 |  | —
Long-term investments | ​ | 18,031 | ​ | — | ​ | 366 | ​ | 17,665
​ | ​ | 839,165 | ​ | 2,249 | ​ | 819,251 | ​ | 17,665
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | Fair value measurement at reporting date using
​ |  | Fair value |  | Quoted Prices in Active |  | ​ |  | Significant
​ |  | as of |  | Markets for Identical |  | Significant Other |  | Unobservable
​ |  | December 31, |  | Assets |  | Observable Inputs |  | Inputs
Description |  | 2023 |  | (Level 1) |  | (Level 2) |  | (Level 3)
​ |  | US$ | ​ | US$ | ​ | US$ | ​ | US$
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments |  | 291,023 |  | 2,265 |  | 288,758 |  | —
Long-term investments |  | 10,110 |  | — |  | 236 |  | 9,874
​ | ​ | 301,133 | ​ | 2,265 | ​ | 288,994 | ​ | 9,874
Schedule of roll forward of major Level 3 investments | ​
​ | ​ | ​
​ |  | US$
​ | ​ | ​
Fair value of Level 3 investments as of December 31, 2021 |  | 25,583
New addition |  | 1,575
The change in fair value of the investments |  | (9,493)
Fair value of Level 3 investments as of December 31, 2022 |  | 17,665
The change in fair value of the investments | ​ | (7,791)
Fair value of Level 3 investments as of December 31, 2023 | ​ | 9,874
Schedule of significant unobservable inputs adopted in the valuation | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | As of December 31, |
​ |  | 2022 |  | 2023 | ​
Unobservable Inputs | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​
Expected volatility |  | 40%-63 | % | 40%-59 | %
Probability |  | Liquidation scenario:35%-45 | % | Liquidation scenario:38%-40 | %
​ |  | Redemption scenario:35%-45 | % | Redemption scenario:38%-40 | %
​ |  | IPO scenario:10%-30 | % | IPO scenario:20%-25 | %
Schedule of property, plant and equipment estimated useful life | ​
​ | ​ | ​
Leasehold improvements |  | the shorter of their useful lives and the lease terms
Computers and electronic equipment |  | 3 years
Office equipment |  | 3 years
Software |  | 3 years
Disaggregated major revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2021 |  | 2022 |  | 2023
​ | ​ | US$ | ​ | US$ | ​ | US$
IoT PaaS |  | 261,360 |  | 152,914 | ​ | 167,694
Smart device distribution |  | 22,153 |  | 25,446 | ​ | 26,517
SaaS and others |  | 18,563 |  | 29,812 | ​ | 35,779
Total revenue |  | 302,076 |  | 208,172 | ​ | 229,990

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References No definition available. + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 + Details
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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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