Stock-Based Compensation - Schedule of Stock Based Compensation Expense (Detail) - USD ($) |
3 Months Ended | 9 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||||
| Stock based compensation expense | $ 137,000 | $ 29,000 | $ 428,000 | $ 85,000 | $ 124,847 | $ 96,013 |
| Research and development [Member] | ||||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||||
| Stock based compensation expense | 26,000 | 0 | 74,000 | 38,000 | 81,015 | 68,281 |
| General and administrative [Member] | ||||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||||
| Stock based compensation expense | $ 111,000 | $ 29,000 | $ 354,000 | $ 47,000 | $ 43,832 | $ 27,732 |