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Fair Value Measurements - Cost, Unrealized Gains or Losses, and Fair Value by Investment Type (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Cost, Unrealized Gains or Losses, and Fair Value by Investment |  |
Cost | $ 104,324 | $ 191,623
Unrealized Gain | 2 | 43
Unrealized (Loss) | (11) | (21)
Fair Value | 104,315 | 191,645
Money market funds |  |
Cost, Unrealized Gains or Losses, and Fair Value by Investment |  |
Cost | 79,484 | 55,060
Fair Value | 79,484 | 55,060
U.S. government agency securities |  |
Cost, Unrealized Gains or Losses, and Fair Value by Investment |  |
Cost | 5,200 | 19,929
Unrealized Gain |  | 35
Unrealized (Loss) | (5) |
Fair Value | 5,195 | 19,964
U.S. treasury securities |  |
Cost, Unrealized Gains or Losses, and Fair Value by Investment |  |
Cost | 11,967 | 68,431
Unrealized Gain | 2 | 8
Unrealized (Loss) |  | (21)
Fair Value | 11,969 | 68,418
Commercial paper and corporate notes |  |
Cost, Unrealized Gains or Losses, and Fair Value by Investment |  |
Cost | 7,673 | 48,203
Unrealized (Loss) | (6) |
Fair Value | $ 7,667 | $ 48,203

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