Cover Page - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Feb. 27, 2026 |
Jun. 30, 2025 |
|
| Cover [Abstract] | |||
| Document Type | 10-K | ||
| Amendment Flag | false | ||
| Entity Central Index Key | 0002081043 | ||
| Entity Registrant Name | AtaiBeckley Inc. | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Document Period End Date | Dec. 31, 2025 | ||
| Document Fiscal Year Focus | 2025 | ||
| Document Fiscal Period Focus | FY | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Voluntary Filers | No | ||
| Trading Symbol | ATAI | ||
| Title of 12(b) Security | Common stock, par value $0.01 per share | ||
| Security Exchange Name | NASDAQ | ||
| Entity Filer Category | Non-accelerated Filer | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Entity Shell Company | false | ||
| Entity Small Business | true | ||
| Entity Emerging Growth Company | true | ||
| Entity Ex Transition Period | false | ||
| Entity File Number | 001-43037 | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Address, Address Line One | c/o atai Life Sciences US, Inc. | ||
| Entity Address, Address Line Two | c/o Industrious NYC | ||
| Entity Address, Address Line Three | 250 West 34th Street | ||
| Entity Address, City or Town | New York | ||
| Entity Address, State or Province | NY | ||
| City Area Code | 332 | ||
| Local Phone Number | 282-0507 | ||
| Entity Address, Postal Zip Code | 10119 | ||
| Entity Tax Identification Number | 41-3357923 | ||
| Entity Public Float | $ 361.3 | ||
| Auditor Attestation Flag | false | ||
| Document Financial Statement Error Correction [Flag] | false | ||
| Entity Common Stock, Shares Outstanding | 364,745,985 | ||
| Auditor Firm ID | 34 | ||
| Auditor Name | DELOITTE & TOUCHE LLP | ||
| Auditor Location | New Jersey | ||
| Auditor Opinion | Opinion on the Financial Statements We have audited the accompanying consolidated balance sheets of AtaiBeckley Inc. and subsidiaries (the "Company") as of December 31, 2025 and 2024, the related consolidated statements of operations, comprehensive loss, stockholders’ equity, and cash flows, for each of the two years in the period ended December 31, 2025, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of its operations and its cash flows for each of the two years in the period ended December 31, 2025, in conformity with accounting principles generally accepted in the United States of America. |
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| Documents Incorporated By Reference TextBlock | DOCUMENTS INCORPORATED BY REFERENCE Portions of the Registrant’s definitive proxy statement relating to its 2026 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission (the "SEC") within 120 days after the end of the fiscal year ended December 31, 2025, are incorporated herein by reference in Part III where indicated. |