| Line Item | Jun 30, 2026 | Mar 31, 2026 | Dec 31, 2025 | Sep 30, 2025 | Jun 30, 2025 | Mar 31, 2025 | Dec 31, 2024 | Sep 30, 2024 | Jun 30, 2024 | Mar 31, 2024 | Dec 31, 2023 | Sep 30, 2023 | Jun 30, 2023 | Mar 31, 2023 | Dec 31, 2022 | Sep 30, 2022 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| REVENUES | ||||||||||||||||
| Total revenues | — | |||||||||||||||
| YoY growth | -100.0% | — | +100.0% | -100.0% | ||||||||||||
| OPERATING EXPENSES | ||||||||||||||||
| Research and development | ||||||||||||||||
| General and administrative | ||||||||||||||||
| Total operating expenses | ||||||||||||||||
| % of revenue | — | — | — | — | ||||||||||||
| Loss from operations | — | |||||||||||||||
| % of revenue | — | — | — | — | ||||||||||||
| OTHER INCOME (EXPENSE), NET | ||||||||||||||||
| Interest expense | ||||||||||||||||
| Change in fair value of warrants | ||||||||||||||||
| Change in fair value of tranche liability | — | — | ||||||||||||||
| Loss on extinguishment of financial commitment assets and contingent warrants, net | — | — | ||||||||||||||
| Other income, net | ||||||||||||||||
| Total other income (expense), net | ||||||||||||||||
| NET LOSS | ||||||||||||||||
| % of revenue | — | — | — | — | ||||||||||||
| Less: Net loss attributable to noncontrolling interest | ||||||||||||||||
| NET LOSS ATTRIBUTABLE TO SERINA THERAPEUTICS, INC. | ||||||||||||||||
| % of revenue | — | — | — | — | ||||||||||||
| NET LOSS ATTRIBUTABLE TO SERINA COMMON STOCKHOLDERS | — | — | ||||||||||||||
| NET LOSS ATTRIBUTABLE TO SERINA COMMON STOCKHOLDER, BASIC (in usd per share) | — | |||||||||||||||
| NET LOSS ATTRIBUTABLE TO SERINA COMMON STOCKHOLDER, DILUTED (in usd per share) | — |