Cash, Cash Equivalents and Marketable Securities - Summary (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Cash and cash equivalents:
Total cash and cash equivalents	$ 622,517	$ 99,915
Marketable securities:
Unrealized gains	57	476
Unrealized losses	(229)	(8)
Cost	1,059,235	633,663
Fair value	1,059,063	634,131
Corporate debt securities
Cash and cash equivalents:
Total cash and cash equivalents	14,870	3,664
Marketable securities:
Cost	260,811	382,028
Unrealized gains	32	195
Unrealized losses	(140)	(7)
Fair value	260,703	382,216
Corporate Debt Securities Due Within One To Two Years Of Date Of Purchase
Marketable securities:
Cost		977
Unrealized gains		1
Unrealized losses		0
Fair value		978
US government and government sponsored entities
Cash and cash equivalents:
Total cash and cash equivalents		14,967
U.S. government and government sponsored entities due within 1 year of date of purchase
Marketable securities:
Cost	175,907	150,743
Unrealized gains	25	280
Unrealized losses	(89)	(1)
Fair value	175,843	151,022
Cash
Cash and cash equivalents:
Total cash and cash equivalents	3,094	2,729
Money market funds
Cash and cash equivalents:
Total cash and cash equivalents	$ 604,553	$ 78,555