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Fair Value Measurements - Cost, Unrealized Gains or Losses, and Fair Value by Investment Type (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Cost, Unrealized Gains or Losses, and Fair Value by Investment |  |
Cost | $ 191,467 |
Unrealized Gain | 74 |
Unrealized (Loss) | (2) |
Fair Value | 191,539 |
Money market funds |  |
Cost, Unrealized Gains or Losses, and Fair Value by Investment |  |
Cost | 92,289 | $ 125,549
Fair Value | 92,289 | $ 125,549
U.S. government agency securities |  |
Cost, Unrealized Gains or Losses, and Fair Value by Investment |  |
Cost | 6,748 |
Unrealized Gain | 4 |
Fair Value | 6,752 |
U.S. treasury securities |  |
Cost, Unrealized Gains or Losses, and Fair Value by Investment |  |
Cost | 53,347 |
Unrealized Gain | 33 |
Unrealized (Loss) | (1) |
Fair Value | 53,379 |
Commercial paper and corporate notes |  |
Cost, Unrealized Gains or Losses, and Fair Value by Investment |  |
Cost | 39,083 |
Unrealized Gain | 37 |
Unrealized (Loss) | (1) |
Fair Value | $ 39,119 |

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