Organization and Basis of Presentation	6 Months Ended
Jun. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	1. Organization and Basis of Presentation Description of Business OmniAb, Inc. (“OmniAb” or the “Company”, formerly known as Avista Public Acquisition Corp. II (“APAC”)) is a biotechnology company that licenses cutting-edge discovery research technology to the pharmaceutical and biotech industries and academic institutions to enable the discovery of next-generation therapeutics. The Company’s technology platform creates and screens diverse antibody repertoires and is designed to quickly identify optimal antibodies and other target-binding proteins for its partners’ drug development efforts. At the heart of the OmniAb platform is something the Company calls Biological Intelligence™, which powers the immune systems of its proprietary, engineered transgenic animals to create optimized antibody candidates for human therapeutics. The Company primarily derives revenue from license fees for technology access, milestones from partnered programs and service revenue from research programs. Business Combination On November 1, 2022 (the “Closing Date”), the Company, Ligand Pharmaceuticals Incorporated, a Delaware corporation (“Ligand”), OmniAb Operations, Inc., a Delaware corporation and wholly-owned subsidiary of Ligand (“Legacy OmniAb”, formerly known as OmniAb, Inc.), and Orwell Merger Sub Inc., a Delaware corporation and a wholly-owned subsidiary of APAC (“Merger Sub”), consummated the transactions contemplated by the Agreement and Plan of Merger (the “Merger Agreement”), dated as of March 23, 2022 (the “Business Combination”). Basis of Presentation The Company’s accompanying condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”). Any reference in these notes to applicable guidance is meant to refer to the authoritative U.S. GAAP as included in the Accounting Standards Codification (“ASC”) and Accounting Standards Updates (“ASU”) of the Financial Accounting Standards Board (“FASB”). The financial information for the three and six months ended June 30, 2025 and 2024, is unaudited but includes all normal and recurring adjustments unless indicated otherwise, which the Company considered necessary for fair presentation of its condensed consolidated statements of operations and comprehensive loss. Certain prior period amounts in the condensed consolidated financial statements have been reclassified to conform to the current period presentation. The accompanying condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and accounts within the Company have been eliminated. Liquidity and Capital Resources The Company expects to continue to incur losses as it invests in research and development activities to improve its technology platform, market and sell its technologies to existing and new partners, add operational, financial and management information systems and personnel to support its operations and incur ongoing costs associated with operating as a public company. The Company’s ability to continue its operations is dependent upon its ability to generate cash flows from operations and potentially obtain additional capital in the future. The Company believes its existing cash, cash equivalents and short-term investments are sufficient to support operations through at least the next 12 months from the date of issuance of these financial statements. The accompanying condensed consolidated financial statements have been prepared assuming the Company will continue as a going concern, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business. Emerging Growth Company OmniAb qualifies as an emerging growth company as defined in Section 2(a) of the Securities Act of 1933, as amended, (“Securities Act”), as modified by the Jumpstart Our Business Startups Act of 2012 (“JOBS Act”). Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. OmniAb has elected not to opt out of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, OmniAb, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of OmniAb’s financial statements with another public company, which is neither an emerging growth company nor an emerging growth company which has opted out of using the extended transition period, difficult because of the potential differences in accounting standards used.

OmniAb, Inc. (“OmniAb” or the “Company”, formerly known as Avista Public Acquisition Corp. II (“APAC”)) is a biotechnology company that licenses cutting-edge discovery research technology to the pharmaceutical and biotech industries and academic institutions to enable the discovery of next-generation therapeutics. The Company’s technology platform creates and screens diverse antibody repertoires and is designed to quickly identify optimal antibodies and other target-binding proteins for its partners’ drug development efforts. At the heart of the OmniAb platform is something the Company calls Biological Intelligence™, which powers the immune systems of its proprietary, engineered transgenic animals to create optimized antibody candidates for human therapeutics. The Company primarily derives revenue from license fees for technology access, milestones from partnered programs and service revenue from research programs.

On November 1, 2022 (the “Closing Date”), the Company, Ligand Pharmaceuticals Incorporated, a Delaware corporation (“Ligand”), OmniAb Operations, Inc., a Delaware corporation and wholly-owned subsidiary of Ligand (“Legacy OmniAb”, formerly known as OmniAb, Inc.), and Orwell Merger Sub Inc., a Delaware corporation and a wholly-owned subsidiary of APAC (“Merger Sub”), consummated the transactions contemplated by the Agreement and Plan of Merger (the “Merger Agreement”), dated as of March 23, 2022 (the “Business Combination”).

The Company’s accompanying condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”). Any reference in these notes to applicable guidance is meant to refer to the authoritative U.S. GAAP as included in the Accounting Standards Codification (“ASC”) and Accounting Standards Updates (“ASU”) of the Financial Accounting Standards Board (“FASB”). The financial information for the three and six months ended June 30, 2025 and 2024, is unaudited but includes all normal and recurring adjustments unless indicated otherwise, which the Company considered necessary for fair presentation of its condensed consolidated statements of operations and comprehensive loss. Certain prior period amounts in the condensed consolidated financial statements have been reclassified to conform to the current period presentation.

The Company expects to continue to incur losses as it invests in research and development activities to improve its technology platform, market and sell its technologies to existing and new partners, add operational, financial and management information systems and personnel to support its operations and incur ongoing costs associated with operating as a public company. The Company’s ability to continue its operations is dependent upon its ability to generate cash flows from operations and potentially obtain additional capital in the future. The Company believes its existing cash, cash equivalents and short-term investments are sufficient to support operations through at least the next 12 months from the date of issuance of these financial statements.

Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. OmniAb has elected not to opt out of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, OmniAb, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of OmniAb’s financial statements with another public company, which is neither an emerging growth company nor an emerging growth company which has opted out of using the extended transition period, difficult because of the potential differences in accounting standards used.