Description of Business and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Significant Accounting Policies	Description of Business and Significant Accounting Policies Description of Business ON24, Inc. and its subsidiaries (together, ON24 or the Company) provides a leading, cloud-based platform for digital engagement that delivers insights for revenue growth through interactive webinar experiences, virtual event experiences and multimedia content experiences. The Company’s platform offers a portfolio of interactive, personalized and content-rich digital experience products that creates and captures actionable, real-time data at scale from millions of professionals every month to provide businesses with buying signals and behavioral insights to efficiently convert prospects into customers. The Company was incorporated in the state of Delaware in January 1998 as NewsDirect, Inc. and in December 1998 changed its name to ON24, Inc. The Company is headquartered in San Francisco, California. Basis of Presentation The accompanying condensed consolidated financial statements include the accounts of ON24 Inc. and its subsidiaries and have been prepared in accordance with generally accepted accounting principles in the United States of America (U.S. GAAP) and applicable rules and regulations of the Securities and Exchange Commission (SEC) for interim financial reporting. Certain information and note disclosures included in the Company’s annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s annual report on Form 10-K for the year ended December 31, 2022. In the opinion of management, the condensed consolidated financial statements reflect all adjustments that are normal and recurring in nature and necessary for fair financial statement presentation. All intercompany transactions and balances have been eliminated in consolidation. Use of Estimates The preparation of 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 disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Significant items subject to such estimates and assumptions include, but are not limited to, the estimated expected benefit period for deferred contract acquisition costs, the determination of standalone selling price for the Company’s performance obligations, the allowance for doubtful accounts and billing reserve, the useful lives of long-lived assets, the assumptions used to measure stock-based compensation, the valuation of deferred income tax assets and uncertain tax positions. Actual results could differ from those estimates. Significant Accounting Policies The Company’s significant accounting policies are disclosed in its Annual Report on Form 10-K for the year ended December 31, 2022. There have been no significant changes to these policies during the nine months ended September 30, 2023 Recently Adopted Accounting Standards In June 2016, FASB issued ASU No. 2016-13, Financial Instruments Topic 326: Credit Losses Measurement of Credit Losses on Financial Instruments, as amended, which requires an entity to measure all expected credit losses for financial instruments held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts utilizing a new impairment model known as the current expected credit loss (CECL) model. This new standard also requires credit losses related to available for sale debt securities to be recorded as an allowance through net income rather than by reducing the carrying amount under the other-than-temporary-impairment model. The Company adopted ASU No. 2016-13 on January 1, 2023 and the impact of the adoption was not material to the Company’s condensed consolidated financial statements and related disclosures.