Summary of significant accounting policies (Policies)	6 Months Ended
Summary of significant accounting policies (Policies)	Mar. 31, 2022
Accounting Policies [Abstract]
Basis of presentation and use of estimates	Basis of presentation and use of estimates The accompanying unaudited condensed consolidated financial statements were prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information. Certain information and disclosures normally included in the consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. Accordingly, these unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes included in the Annual Report on Form 10-K for the fiscal year ended September 30, 2021 (the Annual Report on Form 10-K) filed with the Securities and Exchange Commission on November 23, 2021. The condensed consolidated financial statements are unaudited and have been prepared on a basis consistent with that used to prepare the audited annual consolidated financial statements and include, in the opinion of management, all adjustments, consisting of normal and recurring items, necessary for the fair statement of the condensed consolidated financial statements. The condensed consolidated balance sheet at September 30, 2021 is derived from audited consolidated financial statements but does not include all disclosures required by GAAP. The operating results for the three and six months ended March 31, 2022 are not necessarily indicative of the results expected for the full year ending September 30, 2022 or any interim period. The presentation of unaudited condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. The Company’s unaudited condensed consolidated financial statements include its wholly owned subsidiaries. The Company consolidates Revelar Biotherapeutics, Inc. (“Revelar”) as a variable interest entity (“VIE”) for which it is the primary beneficiary (see Note 15 “Investment in variable interest entity” for further information). All intercompany balances and accounts are eliminated in consolidation.
Variable interest entities	Variable interest entities The Company consolidates a VIE in which the Company is deemed to be the primary beneficiary. An entity is generally a VIE if it meets any of the following criteria: (i) the entity has insufficient equity to finance its activities without additional subordinated financial support from other parties, (ii) the equity investors cannot make significant decisions about the entity’s operations or (iii) the voting rights of some investors are not proportional to their obligations to absorb the expected losses of the entity or receive the expected returns of the entity and substantially all of the entity’s activities involve or are conducted on behalf of the investor with disproportionately few voting rights. The Company periodically makes judgments in determining whether its investees are VIEs and, for each reporting period, the Company assesses whether it is the primary beneficiary of its VIE. As of March 31, 2022, the Company was deemed the primary beneficiary of Revelar. See Note 15 “Investment in variable interest entity.”
Recent accounting pronouncements	Recent accounting pronouncements Changes to GAAP are established by the Financial Accounting Standards Board (“FASB”) in the form of accounting standards updates (“ASUs”) to the FASB’s Accounting Standards Codification (“ASC”). The Company considered the applicability and impact of all recent ASUs. ASUs not listed below were assessed and determined to be not applicable to the Company’s consolidated financial position and results of operations. Recent accounting pronouncements adopted In December 2019, the FASB issued ASU 2019 12, Simplifying the Accounting for Income Taxes. The ASU simplifies the accounting for income taxes by eliminating certain exceptions to the guidance in ASC 740, Income Taxes, related to the approach for allocating income tax expense or benefit for the year to continuing operations, discontinued operations, other comprehensive income, and other charges or credits recorded directly to shareholders’ equity; the methodology for calculating income taxes in an interim period; and the recognition of deferred tax liabilities for outside basis differences. The Company adopted this standard effective October 1, 2021. The adoption of ASU 2019 12 did not have an impact on the Company’s consolidated financial statements for either period presented. Recently issued accounting pronouncement not yet adopted In November 2021, the FASB issued ASU 2021 10, Government Assistance (Topic 832): Disclosures by Business Entities about Government Assistance. The amendments in this update require the following annual disclosures about transactions with a government that are accounted for by applying a grant or contribution accounting model. The amendments in this update are effective for all entities within their scope for financial statements issued for annual periods beginning after December 15, 2021. Early application is permitted. The Company is currently evaluating the impact that the adoption of this standard will have on its consolidated financial statements. In June 2016, the FASB issued ASU 2016 13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The new standard requires entities to use the new “expected credit loss” impairment model for most financial assets measured at amortized cost, including trade and other receivables and held-to-maturity debt securities, and modifies the impairment model for available-for-sale debt securities. The standard is effective for the Company for the fiscal year ending September 30, 2024, including interim periods within that fiscal year. Early application is permitted. The Company is currently evaluating the impact that the adoption of this standard will have on its consolidated financial statements.