| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Revenue | ||||||||||||||||
| YoY growth | — | — | -100.0% | — | ||||||||||||
| Operating expenses: | ||||||||||||||||
| Research and development | ||||||||||||||||
| General and administrative | ||||||||||||||||
| Total operating expenses | ||||||||||||||||
| % of revenue | — | 36.9% | — | — | ||||||||||||
| Operating (loss) income | ||||||||||||||||
| % of revenue | — | 63.1% | — | — | ||||||||||||
| Other income (expense), net | — | — | — | — | ||||||||||||
| Interest income | ||||||||||||||||
| Net (loss) income before income taxes and noncontrolling interest | ||||||||||||||||
| Income tax provision | ||||||||||||||||
| Net (loss) income before noncontrolling interest | ||||||||||||||||
| % of revenue | — | 65.5% | — | — | ||||||||||||
| Less: net loss attributable to noncontrolling interest | ||||||||||||||||
| Net (loss) income attributable to vTv Therapeutics Inc. | ||||||||||||||||
| % of revenue | — | 65.5% | — | — | ||||||||||||
| Net (loss) income attributable to vTv Therapeutics Inc. common shareholders | ||||||||||||||||
| Basic net (loss) income per share of vTv Therapeutics Inc. Class A common stock (in usd per share) | ||||||||||||||||
| Diluted net (loss) income per share of vTv Therapeutics Inc. Class A common stock (in usd per share) |