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Basis of presentation and consolidation and significant accounting policies (Policies) | 9 Months Ended
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Sep. 30, 2021
Accounting Policies [Abstract] |
Basis of presentation | (a) Basis of presentation The unaudited condensed consolidated financial statements of the Company have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all information and disclosures necessary for a presentation of the Company’s financial position, results of operations, shareholders’ equity and cash flows in conformity with U.S. generally accepted accounting principles (“U.S. GAAP”). In the opinion of management, these financial statements reflect all normal recurring adjustments and accruals necessary for a fair statement of the Company’s unaudited condensed consolidated financial statements for such periods. The results of operations for any interim period are not necessarily indicative of the results for the full year. The December 31, 2020 condensed consolidated balance sheets data were derived from audited financial statements, but do not include all disclosures required by U.S. GAAP. These financial statements should be read in conjunction with the financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. Interim results are not necessarily indicative of full year results and the unaudited condensed consolidated financial statements may not be indicative of the Group’s future performance.
Principles of consolidation | (b) Principles of consolidation The unaudited condensed consolidated financial statements include the financial statements of the Company and its subsidiaries. All intercompany transactions and balances among the Company and its subsidiaries are eliminated upon consolidation.
Use of estimates | (c) Use of estimates The preparation of the unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the period. Areas where management uses subjective judgment include, but are not limited to, estimating the useful lives of long-lived assets, estimating the current expected credit losses for financial assets, assessing the impairment of long-lived assets, discount rate of operating lease liabilities, accrual of rebate, allocation of the research and development service expenses to the appropriate financial reporting period based on the progress of the research and development projects, share-based compensation expenses, recoverability of deferred tax assets and a lack of marketability discount of the ordinary shares issued in connection with collaboration and license arrangement (Note 15). Management bases the estimates on historical experience and various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results could differ from these estimates.
Long-term investments | (d) Long-term investments Long-term investments represent equity-method investments and equity investments with readily determinable fair values. The Group accounts for equity investment in entities with significant influence under equity-method accounting. Under this method, the Group’s pro rata share of income (loss) from investment is recognized in the consolidated statements of comprehensive income. Dividends received reduce the carrying amount of the investment. When the Group’s share of loss in an equity-method investee equals or exceeds its carrying value of the investment in that entity, the Group continues to report its share of equity method losses in the statements of comprehensive income to the extent and as an adjustment to the carrying amount of its other investments in the investee. Equity-method investment is reviewed for impairment by assessing if the decline in market value of the investment below the carrying value is other-than-temporary. In making this determination, factors are evaluated in determining whether a loss in value should be recognized. These include consideration of the intent and ability of the Group to hold investment and the ability of the investee to sustain an earnings capacity, justifying the carrying amount of the investment. Impairment losses are recognized in other expense when a decline in value is deemed to be other-than-temporary. Investments in equity securities that have readily determinable fair values (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) are measured at fair value, with unrealized gains and losses from fair value changes recognized in other (expenses) income, net in the unaudited condensed consolidated statements of operations.
Fair value measurements | (e) Fair value measurements The Group applies ASC topic 820 (“ASC 820”), Fair Value Measurements and Disclosures, in measuring fair value. ASC 820 defines fair value, establishes a framework for measuring fair value and requires disclosures to be provided on fair value measurement. ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: Level 1 - Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2 - Include other inputs that are directly or indirectly observable in the marketplace. Level 3 - Unobservable inputs which are supported by little or no market activity. ASC 820 describes three main approaches to measuring the fair value of assets and liabilities: (1) market approach; (2) income approach and (3) cost approach. The market approach uses prices and other relevant information generated from market transactions involving identical or comparable assets or liabilities. The income approach uses valuation techniques to convert future amounts to a single present value amount. The measurement is based on the value indicated by current market expectations about those future amounts. The cost approach is based on the amount that would currently be required to replace an asset. The Group did not have any assets or liabilities that were measured at fair value on a recurring basis prior to 2021. As of September 30, 2021, information about inputs into the fair value measurement of the Group’s assets that are measured at a fair value on a recurring basis in periods subsequent to their initial recognition is as follows:
Description |  | Fair Value as of September 30, 2021 US$ |  |  | Fair Value Measurement at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) US$ |
Equity Investments with Readily Determinable Fair Value |  |  | 20,070 |  |  |  | 20,070 |
Financial instruments of the Group primarily include cash, cash equivalents and restricted cash, short-term investments, accounts receivable, prepayments and other current assets, long-term investments, accounts payable and other current liabilities . As of September 30, 2021 and December 31, 2020, the carrying values of cash and cash equivalents, short-term investments, accounts receivable, prepayments and other current assets, accounts payable and other payable approximated their fair values due to the short-term maturity of these instruments, and the carrying value of restricted cash approximates its fair value based on the nature of the assessment of the ability to recover these amounts.
Recent accounting pronouncements | (f) Recent accounting pronouncements Adopted Accounting Standards In December 2019, the Financial Accounting Standard Board (“FASB”) issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes . This update simplifies the accounting for income taxes as part of the FASB’s overall initiative to reduce complexity in accounting standards. The amendments include removal of certain exceptions to the general principles of ASC 740, Income taxes , and simplification in several other areas such as accounting for a franchise tax (or similar tax) that is partially based on income. The update is effective in fiscal years beginning after December 15, 2020, and interim periods therein, and early adoption is permitted. Certain amendments in this update should be applied retrospectively or modified retrospectively, all other amendments should be applied prospectively. The Group adopted this standard on January 1, 2021. There was no material impact to the Group’s financial position or results of operations upon adoption.
Significant accounting policies | (g) Significant accounting policies For a more complete discussion of the Company’s significant accounting policies and other information, the unaudited condensed consolidated financial statements and notes thereto should be read in conjunction with the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020.

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