Fair Value Measurements - Fair Value of Financial Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	$ 1,741,879	$ 1,017,704
Marketable Securities:	5,541,116
Total Financial Assets	7,284,406	4,087,924
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	5,580,271	3,063,694
Unrealized Gains	8,736	6,827
Unrealized Losses	(13,525)	(4,160)
Fair Value	5,575,482	3,066,361
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	48,815	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	48,815	1,999
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	48,815	1,999
Certificates of deposits
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	5,000
U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	1,921,490	1,044,859
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	1,954,733	1,043,445
Unrealized Gains	2,739	2,874
Unrealized Losses	(4,616)	(1,460)
Fair Value	1,952,856	1,044,859
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	2,593,547	1,362,124
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	2,595,682	1,361,132
Unrealized Gains	4,356	2,810
Unrealized Losses	(6,491)	(1,818)
Fair Value	2,593,547	1,362,124
Agency securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	977,264	657,379
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	981,041	657,118
Unrealized Gains	1,641	1,143
Unrealized Losses	(2,418)	(882)
Fair Value	980,264	657,379
Marketable securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities	5,541,116	3,069,362
Money market funds - restricted cash
Assets, Fair Value Disclosure [Abstract]
Money market funds - restricted cash	1,411	858
Level I
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	1,738,879	1,015,705
Total Financial Assets	3,661,780	2,061,422
Level I \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Level I \| Certificates of deposits
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Level I \| U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	1,921,490	1,044,859
Level I \| Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Level I \| Agency securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Level I \| Marketable securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities	1,921,490	1,044,859
Level I \| Money market funds - restricted cash
Assets, Fair Value Disclosure [Abstract]
Money market funds - restricted cash	1,411	858
Level II
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	3,000	1,999
Total Financial Assets	3,622,626	2,026,502
Level II \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	48,815	0
Level II \| Certificates of deposits
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	5,000
Level II \| U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Level II \| Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	2,593,547	1,362,124
Level II \| Agency securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	977,264	657,379
Level II \| Marketable securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities	3,619,626	2,024,503
Level II \| Money market funds - restricted cash
Assets, Fair Value Disclosure [Abstract]
Money market funds - restricted cash	0	0
Level III
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Total Financial Assets	0	0
Level III \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Level III \| Certificates of deposits
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Level III \| U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Level III \| Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Level III \| Agency securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Level III \| Marketable securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities	0	0
Level III \| Money market funds - restricted cash
Assets, Fair Value Disclosure [Abstract]
Money market funds - restricted cash	0	0
Money market funds
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	1,707,513	1,015,705
Money market funds \| Level I
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	1,707,513	1,015,705
Money market funds \| Level II
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Money market funds \| Level III
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	1,999
Commercial paper \| Level I
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Commercial paper \| Level II
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	1,999
Commercial paper \| Level III
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Agency securities
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	3,000	0
Agency securities \| Level I
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Agency securities \| Level II
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	3,000	0
Agency securities \| Level III
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	31,366	0
U.S. government notes \| Level I
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	31,366	0
U.S. government notes \| Level II
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
U.S. government notes \| Level III
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	$ 0	$ 0

Cash, Cash Equivalents And Available-For-Sale Debt Securities, Amortized Cost

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Cash, Cash Equivalents, And Marketable Securities

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Fair value portion of asset recognized for present right to economic benefit.

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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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Amount, before tax, of unrealized loss 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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