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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
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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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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