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FAIR VALUE MEASUREMENT | 12 Months Ended
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Dec. 31, 2024
Fair Value Disclosures [Abstract] |
FAIR VALUE MEASUREMENT | 12. FAIR VALUE MEASUREMENT Measured at fair value on a recurring basis The Company measures financial instruments held, at fair value, cash and cash equivalents, and long-term available-for-sale securities, on a recurring basis. Most of the Company’s financial instruments held, at fair value are classified as Level 1 since their fair value are determined based on the quoted market price. Some of the Company’s financial instruments held, at fair value that are valued at quoted prices in less active markets are classified as Level 2. Investments in private equity funds are categorized as Level 3 since they are valued utilizing third-party pricing information without adjustment. The Company classified its money market funds, which are presented in cash and cash equivalents due to high liquidity to be convertible to known amounts of cash and near maturity that they present insignificant risk of changes in value, as Level 1 since their fair value are determined based on the quoted market price. The Group measured the fair value of its long-term available-for-sale securities using a market approach and considered those as Level 3 measurement because the Group used unobservable inputs to determine their fair values. The unobservable inputs used were discounts for lack of marketability for such market approach (ranging from 10% to 15%), and the observable inputs used were risk-free interest rates (ranging from 3.5% to 4.5%), as of December 31, 2023 and 2024. Significant increases or decreases in any of those inputs in isolation would result in a significant change in fair value measurement. 12. FAIR VALUE MEASUREMENT (Continued) Measured at fair value on a recurring basis (Continued) As of December 31, 2023 and 2024, information about inputs for the fair value measurements of the Group’s assets that were measured at fair value on a recurring basis in periods subsequent to their initial recognition is as follows:
|  | As of December 31, 2024 |
|  | Quoted prices in active markets for identical instruments (Level 1) |  |  | Significant other observable inputs (Level 2) |  |  | Significant unobservable inputs (level 3) |  |  | Total balance |
|  | US$ |  |  | US$ |  |  | US$ |  |  | US$ |
Financial instruments held, at fair value |  |  |  |  |  |  |  |  |  |  |  |
Funds |  |  | 2,691,097 |  |  |  | 11,770,376 |  |  |  | 3,692,505 |  |  |  | 18,153,978 |
Bonds |  |  | 54,418,366 |  |  |  | — |  |  |  | — |  |  |  | 54,418,366 |
Stock |  |  | 2,270,679 |  |  |  | — |  |  |  | — |  |  |  | 2,270,679 |
Others |  |  | 704,059 |  |  |  | — |  |  |  | — |  |  |  | 704,059 |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |
Funds |  |  | 4,023,182 |  |  |  | — |  |  |  | — |  |  |  | 4,023,182 |
Long‑term available-for-sale securities |  |  | — |  |  |  | — |  |  |  | 4,410,382 |  |  |  | 4,410,382 |
Total |  |  | 64,107,383 |  |  |  | 11,770,376 |  |  |  | 8,102,887 |  |  |  | 83,980,646 |
|  | As of December 31, 2023 |
|  | Quoted prices in active markets for identical instruments (Level 1) |  |  | Significant other observable inputs (Level 2) |  |  | Significant unobservable inputs (level 3) |  |  | Total balance |
|  | US$ |  |  | US$ |  |  | US$ |  |  | US$ |
Financial instruments held, at fair value |  |  |  |  |  |  |  |  |  |  |  |
Funds |  |  | 2,634,959 |  |  |  | 353,525 |  |  |  | 3,435,440 |  |  |  | 6,423,924 |
Bonds |  |  | 418,077,123 |  |  |  | — |  |  |  | — |  |  |  | 418,077,123 |
Stock |  |  | 3,014,507 |  |  |  | — |  |  |  | — |  |  |  | 3,014,507 |
Others |  |  | 644,000 |  |  |  | — |  |  |  | — |  |  |  | 644,000 |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |
Funds |  |  | 6,428,256 |  |  |  | — |  |  |  | — |  |  |  | 6,428,256 |
Long‑term available-for-sale securities |  |  | — |  |  |  | — |  |  |  | 4,066,490 |  |  |  | 4,066,490 |
Total |  |  | 430,798,845 |  |  |  | 353,525 |  |  |  | 7,501,930 |  |  |  | 438,654,300 |
12. FAIR VALUE MEASUREMENT (Continued) Measured at fair value on a recurring basis (Continued) During the years ended December 31, 2023 and 2024, there were no transfers between level 1, level 2 and level 3 categories. The movements of Level 3 fair value measurements for the years ended December 31, 2023 and 2024 are as follows:
|  | US$ |
As of January 1, 2023 |  |  | 7,378,683 |
Additions during the year |  |  | 1,000,000 |
Net unrealized loss |  |  | (876,753 | )
As of December 31, 2023 |  |  | 7,501,930 |
Additions during the year |  |  | — |
Net unrealized gain |  |  | 600,957 |
As of December 31, 2024 |  |  | 8,102,887 |
For the year ended December 31, 2023, the unrealized loss included US$450,325 recognized in other comprehensive income (loss) in the consolidated statements of comprehensive income (loss), and the unrealized loss US$426,428 recognized in other income in the consolidated statements of comprehensive income (loss). For the year ended December 31, 2024, the unrealized gain included US$343,892 recognized in other comprehensive income (loss) in the consolidated statements of comprehensive income (loss), and the unrealized loss US$257,065 recognized in other income in the consolidated statements of comprehensive income (loss). The Group recognized US$472,605, nil and nil impairment loss related to the long-term available-for-sale securities as an offset of other income for the years ended December 31, 2022, 2023 and 2024. Measured at fair value on a non‑recurring basis The Group measures the equity securities without readily determinable fair value at fair value on a nonrecurring basis whenever there is an impairment indicator or any changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. There was no impairment loss related to the long-term equity securities without readily determinable fair value for the years ended December 31, 2023 and 2024. The Group measured the value of its share options and restricted share units granted to employees and management at fair value to determine the share-based compensation expenses on each of the grant date. The fair value was determined using models with significant unobservable inputs (Level 3 inputs). Key inputs and parameters primarily include risk-free interest rate, expected stock price volatility, dividend yields, expected term, and forfeiture rates. The Group measures goodwill at fair value on a nonrecurring basis and performs a goodwill impairment test annually or more often if event occur or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carry amount. The fair value of goodwill is determined using discounted cash flows, and an impairment loss will be recognized for any excess in the carrying value of goodwill over the implied fair value of goodwill. The Group did not recognize any impairment loss related to goodwill during the years ended December 31, 2023 and 2024. The Group measured acquired intangible assets using the income approach‑discounted cash flow method when events or changes in circumstances indicate that the carrying amount of an asset may no longer be recoverable. The Group did no t recognize any impairment loss related to other intangible assets arising from acquisitions during the years ended December 31, 2023 and 2024. Key inputs and parameters primarily for the above impairment assessment include significant judgment and estimates by the management on future earnings, and discount rate.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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