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Investments and Fair Value Measurements - Schedule of Assets Carried at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets
Cash equivalents	$ 175,325	$ 73,635
Marketable investments	675,704	587,096
Level 1
Assets
Cash equivalents	175,325	71,644
Marketable investments	508,385	315,437
Level 2
Assets
Cash equivalents	0	1,991
Marketable investments	167,319	271,659
Level 3
Assets
Cash equivalents	0	0
Marketable investments	0	0
Certificates of deposit
Assets
Marketable investments	1,547	1,463
Certificates of deposit | Level 1
Assets
Marketable investments	0	0
Certificates of deposit | Level 2
Assets
Marketable investments	1,547	1,463
Certificates of deposit | Level 3
Assets
Marketable investments	0	0
U.S. treasury securities
Assets
Marketable investments	508,385	315,437
U.S. treasury securities | Level 1
Assets
Marketable investments	508,385	315,437
U.S. treasury securities | Level 2
Assets
Marketable investments	0	0
U.S. treasury securities | Level 3
Assets
Marketable investments	0	0
U.S. agency and government sponsored securities
Assets
Marketable investments	113,291	239,259
U.S. agency and government sponsored securities | Level 1
Assets
Marketable investments	0	0
U.S. agency and government sponsored securities | Level 2
Assets
Marketable investments	113,291	239,259
U.S. agency and government sponsored securities | Level 3
Assets
Marketable investments	0	0
Commercial paper
Assets
Marketable investments	9,968	17,391
Commercial paper | Level 1
Assets
Marketable investments	0	0
Commercial paper | Level 2
Assets
Marketable investments	9,968	17,391
Commercial paper | Level 3
Assets
Marketable investments	0	0
Municipal bonds
Assets
Marketable investments		928
Municipal bonds | Level 1
Assets
Marketable investments		0
Municipal bonds | Level 2
Assets
Marketable investments		928
Municipal bonds | Level 3
Assets
Marketable investments		0
Corporate bonds
Assets
Marketable investments	42,513	12,618
Corporate bonds | Level 1
Assets
Marketable investments	0	0
Corporate bonds | Level 2
Assets
Marketable investments	42,513	12,618
Corporate bonds | Level 3
Assets
Marketable investments	0	0
Money market funds
Assets
Cash equivalents	157,556	66,661
Money market funds | Level 1
Assets
Cash equivalents	157,556	66,661
Money market funds | Level 2
Assets
Cash equivalents	0	0
Money market funds | Level 3
Assets
Cash equivalents	0	0
Certificates of deposit
Assets
Cash equivalents		493
Certificates of deposit | Level 1
Assets
Cash equivalents		0
Certificates of deposit | Level 2
Assets
Cash equivalents		493
Certificates of deposit | Level 3
Assets
Cash equivalents		0
U.S. treasury securities
Assets
Cash equivalents	17,769	4,983
U.S. treasury securities | Level 1
Assets
Cash equivalents	17,769	4,983
U.S. treasury securities | Level 2
Assets
Cash equivalents	0	0
U.S. treasury securities | Level 3
Assets
Cash equivalents	$ 0	0
Commercial paper
Assets
Cash equivalents		1,498
Commercial paper | Level 1
Assets
Cash equivalents		0
Commercial paper | Level 2
Assets
Cash equivalents		1,498
Commercial paper | Level 3
Assets
Cash equivalents		$ 0

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