Summary of Significant Accounting Policies - Summary of Sponsorship Funding Payments (Detail) - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2025 |
Dec. 31, 2024 |
|
| Accounting Policies [Abstract] | ||
| Balance at Beginning | $ 3,859 | $ 3,493 |
| Amounts incurred | 384 | 1,210 |
| Recorded sponsor funding reduction | (779) | (844) |
| Balance at Ending | $ 3,464 | $ 3,859 |