Document and Entity Information |
Jul. 31, 2026 |
|---|---|
| Document And Entity Information [Line Items] | |
| Document Type | 8-K/A |
| Document Period End Date | Jul. 31, 2026 |
| Entity Registrant Name | OBSIDIAN THERAPEUTICS, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-43430 |
| Entity Tax Identification Number | 42-1977778 |
| Entity Address Address Line 1 | 1030 Massachusetts Avenue |
| Entity Address City Or Town | Cambridge |
| Entity Address State Or Province | MA |
| Entity Address Postal Zip Code | 02138 |
| City Area Code | 781 |
| Local Phone Number | 806-6245 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common stock, par value $0.0001 per share |
| Trading Symbol | OBX |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Amendment Flag | true |
| Amendment Description | Explanatory Note As previously disclosed in the Current Report on Form 8-K filed by Obsidian Therapeutics, Inc., with the Securities Exchange Commission (“SEC”) on August 3, 2026 (the “Original Filing”), on the Closing Date, Parent completed the previously announced Mergers pursuant to the Merger Agreement dated April 14, 2026, by and among Parent, Legacy Obsidian, Legacy Galera, Obsidian Merger Sub and Galera Merger Sub. This Current Report on Form 8-K/A (this “Amendment No. 1”) has been filed to amend and supplement the Original Filing and provide the financial statements described in Item 9.01 below, which were not previously filed with the Original Filing, and which are permitted to be filed by amendment no later than 71 calendar days after the date the Original Filing was required to be filed with the SEC. No other changes have been made to the Original Filing. This Amendment No. 1 should be read in conjunction with the Original Filing. Capitalized terms used herein that are not otherwise defined shall have the meanings set forth in the Original Filing. The pro forma financial information included as Exhibit 99.3 to this Amendment No. 1 has been presented for illustrative purposes only, as required by Form 8-K, and is not intended to, and does not purport to, represent what the combined company’s actual results or financial condition would have been if the Mergers had occurred on the relevant date, and is not intended to project the future results or financial condition that the combined company may achieve following the Mergers. |
| Entity Central Index Key | 0002130606 |