Fair Value Measurements - Schedule of Fair Value of Financial Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	$ 1,017,704	$ 397,261
Marketable Securities:	3,064,362	2,322,469
Total Financial Assets	4,087,924	2,753,554
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	3,061,695	2,350,988
Unrealized Gains	6,827	357
Unrealized Losses	(4,160)	(28,876)
Fair Value	3,064,362	2,322,469
Certificates of deposits
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	5,000	10,492
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	5,000	10,492
U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	1,044,859	993,955
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	1,043,445	1,007,175
Unrealized Gains	2,874	3
Unrealized Losses	(1,460)	(13,223)
Fair Value	1,044,859	993,955
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	1,362,124	1,113,134
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	1,361,132	1,125,920
Unrealized Gains	2,810	271
Unrealized Losses	(1,818)	(13,057)
Fair Value	1,362,124	1,113,134
Agency securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	657,379	215,380
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	657,118	217,893
Unrealized Gains	1,143	83
Unrealized Losses	(882)	(2,596)
Fair Value	657,379	215,380
Marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Marketable equity securities	0	19,061
Proceeds from sale of marketable equity securities	23,900
Equity securities, realized gain	4,800	10,700
Initial cost for equity investment	3,000
Cumulative gain from initial purchase of equity investment	20,900
Marketable securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities	3,069,362	2,352,022
Money market funds - restricted
Assets, Fair Value Disclosure [Abstract]
Money market funds - restricted	858	4,271
Level I
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	1,015,705	374,280
Total Financial Assets	2,061,422	1,391,567
Level I | Certificates of deposits
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level I | U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	1,044,859	993,955
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	1,044,859	993,955
Level I | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level I | Agency securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level I | Marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Marketable equity securities	0	19,061
Level I | Marketable securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities	1,044,859	1,013,016
Level I | Money market funds - restricted
Assets, Fair Value Disclosure [Abstract]
Money market funds - restricted	858	4,271
Level II
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	1,999	22,981
Total Financial Assets	2,026,502	1,361,987
Level II | Certificates of deposits
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	5,000	10,492
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	5,000	10,492
Level II | U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level II | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	1,362,124	1,113,134
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	1,362,124	1,113,134
Level II | Agency securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	657,379	215,380
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	657,379	215,380
Level II | Marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Marketable equity securities	0	0
Level II | Marketable securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities	2,024,503	1,339,006
Level II | Money market funds - restricted
Assets, Fair Value Disclosure [Abstract]
Money market funds - restricted	0	0
Level III
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Total Financial Assets	0	0
Level III | Certificates of deposits
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level III | U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level III | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level III | Agency securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level III | Marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Marketable equity securities	0	0
Level III | Marketable securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities	0	0
Level III | Money market funds - restricted
Assets, Fair Value Disclosure [Abstract]
Money market funds - restricted	0	0
Money market funds
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	1,015,705	322,294
Money market funds | Level I
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	1,015,705	322,294
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:	1,999	5,422
Commercial paper | Level I
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Commercial paper | Level II
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	1,999	5,422
Commercial paper | Level III
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Agency securities
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	17,559
Agency securities | Level I
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Agency securities | Level II
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	17,559
Agency securities | Level III
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	51,986
U.S. government notes | Level I
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	51,986
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