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Organization and Basis of Presentation (Policies) | 3 Months Ended
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Mar. 31, 2025
Organization and Significant Accounting Policies [Abstract] |
Basis of Presentation | We prepared the unaudited interim condensed consolidated financial statements for the three months ended March 31, 2025 and 2024 on the same basis as the audited financial statements for the year ended December 31, 2024. We included all normal recurring adjustments in the financial statements, which we considered necessary for a fair presentation of our financial position at such dates and our operating results and cash flows for those periods. Our operating results for the interim periods may not be indicative of what our operating results will be for the entire year. For more complete financial information, these financial statements, and notes thereto, should be read in conjunction with the audited financial statements for the year ended December 31, 2024 included in our Annual Report on Form 10-K filed with the Securities and Exchange Commission, or SEC.
Consolidation | In our condensed consolidated financial statements, we included the accounts of Ionis Pharmaceuticals, Inc. and the consolidated results of our wholly owned subsidiary, Akcea Therapeutics, Inc. and its wholly owned subsidiaries (“we”, “us” or “our”).
Segment Information | We operate as a single segment, Ionis operations, because our chief operating decision maker, or CODM, reviews operating results on an aggregate basis and manages our operations as a single operating segment. Refer to Note 14, Segment Information, for further details on our segment information.
Use of Estimates | Use of Estimates We prepare our condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States, or U.S., that require us to make estimates and assumptions that affect the amounts reported in our condensed consolidated financial statements and accompanying notes. Actual results could differ from our estimates.

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