Cash, Cash Equivalents and Marketable Securities - Cash, Cash Equivalents and Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Cash and cash equivalents:
Total cash and cash equivalents	$ 237,684	$ 99,915
Marketable securities:
Unrealized gains	1,304	476
Unrealized losses	(33)	(8)
Cost	1,002,356	633,663
Fair value	1,003,627	634,131
Corporate Debt Securities
Cash and cash equivalents:
Total cash and cash equivalents	58,841	3,664
Marketable securities:
Cost	436,277	382,028
Unrealized gains	573	195
Unrealized losses	(25)	(7)
Fair value	436,825	382,216
Corporate Debt Securities Due Within 1 To 2 Years of Date of Purchase
Marketable securities:
Cost		977
Unrealized gains		1
Unrealized losses		0
Fair value		978
U.S. Government and Government Sponsored Entities
Cash and cash equivalents:
Total cash and cash equivalents	67,541	14,967
U.S. Government and Government Sponsored Entities Due Within 1 Year of Date of Purchase
Marketable securities:
Cost	297,160	150,743
Unrealized gains	411	280
Unrealized losses	(7)	(1)
Fair value	297,564	151,022
U.S. government and government sponsored entities due within 1 to 2 years of date of purchase
Marketable securities:
Cost	31,235
Unrealized gains	320
Unrealized losses	(1)
Fair value	31,554
Cash
Cash and cash equivalents:
Total cash and cash equivalents	25,242	2,729
Money Market Funds
Cash and cash equivalents:
Total cash and cash equivalents	$ 86,060	$ 78,555