Fair Value Measurements - Summary of Fair Value of Financial Instruments (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| U.S. Treasury Money Market Funds [Member] | ||
| Cash equivalents: | ||
| Cash equivalents | $ 28,985 | $ 32,210 |
| U.S. Government Securities [Member] | ||
| Short-term investments: | ||
| Short-term investments | 99,837 | 202,522 |
| Royalty Purchase and Sale Agreement Derivative [Member] | ||
| Current liabilities: | ||
| Derivative current | 193 | 362 |
| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury Money Market Funds [Member] | ||
| Cash equivalents: | ||
| Cash equivalents | 28,985 | 32,210 |
| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Securities [Member] | ||
| Short-term investments: | ||
| Short-term investments | 99,837 | 202,522 |
| Significant Unobservable Inputs (Level 3) [Member] | Royalty Purchase and Sale Agreement Derivative [Member] | ||
| Current liabilities: | ||
| Derivative current | $ 193 | $ 362 |