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Investments and Fair Value Measurements - Schedule of Marketable Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Cost	$ 674,565	$ 587,368
Gross Unrealized Gains	1,178	283
Gross Unrealized Losses	(39)	(555)
Fair Value	675,704	587,096
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Cost	1,545	1,463
Gross Unrealized Gains	2	0
Gross Unrealized Losses	0	0
Fair Value	1,547	1,463
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Cost	507,567	315,608
Gross Unrealized Gains	841	191
Gross Unrealized Losses	(23)	(362)
Fair Value	508,385	315,437
U.S. agency and government-sponsored securities
Debt Securities, Available-for-sale [Line Items]
Cost	113,260	239,358
Gross Unrealized Gains	40	78
Gross Unrealized Losses	(9)	(177)
Fair Value	113,291	239,259
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cost	9,947	17,382
Gross Unrealized Gains	21	9
Gross Unrealized Losses	0	0
Fair Value	9,968	17,391
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Cost		927
Gross Unrealized Gains		1
Gross Unrealized Losses		0
Fair Value		928
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Cost	42,246	12,630
Gross Unrealized Gains	274	4
Gross Unrealized Losses	(7)	(16)
Fair Value	$ 42,513	$ 12,618

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