Fair Value Measurements - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Assets
Cash	$ 324,200	$ 132,500
Short-term investments	1,168,501	1,225,124
Cash and cash equivalents and short-term investments	2,200,000	2,000,000
Restricted cash and cash equivalents and restricted short-term investments		1,500,000
Fair Value Measurements on a Recurring Basis
Assets
Total unrestricted cash equivalents and short-term investments	1,561,749	1,547,248
Total restricted cash equivalents and investments	1,635,922	1,539,974
Total financial assets	3,197,671	3,087,222
Fair Value Measurements on a Recurring Basis \| Level 1
Assets
Total unrestricted cash equivalents and short-term investments	348,269	189,839
Total restricted cash equivalents and investments	13,400	42,699
Total financial assets	361,669	232,538
Fair Value Measurements on a Recurring Basis \| Level 2
Assets
Total unrestricted cash equivalents and short-term investments	1,213,480	1,357,409
Total restricted cash equivalents and investments	1,622,522	1,497,275
Total financial assets	2,836,002	2,854,684
Fair Value Measurements on a Recurring Basis \| Level 3
Assets
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Total financial assets	0	0
Fair Value Measurements on a Recurring Basis \| Money market funds
Assets
Total unrestricted cash equivalents and short-term investments	348,269	189,839
Total restricted cash equivalents and investments	13,400	42,699
Fair Value Measurements on a Recurring Basis \| Money market funds \| Level 1
Assets
Total unrestricted cash equivalents and short-term investments	348,269	189,839
Total restricted cash equivalents and investments	13,400	42,699
Fair Value Measurements on a Recurring Basis \| Money market funds \| Level 2
Assets
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis \| Money market funds \| Level 3
Assets
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis \| Certificates of deposit
Assets
Total unrestricted cash equivalents and short-term investments	201,480	171,358
Total restricted cash equivalents and investments	259,143	189,596
Fair Value Measurements on a Recurring Basis \| Certificates of deposit \| Level 1
Assets
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis \| Certificates of deposit \| Level 2
Assets
Total unrestricted cash equivalents and short-term investments	201,480	171,358
Total restricted cash equivalents and investments	259,143	189,596
Fair Value Measurements on a Recurring Basis \| Certificates of deposit \| Level 3
Assets
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis \| Commercial paper
Assets
Total unrestricted cash equivalents and short-term investments	587,030	762,546
Total restricted cash equivalents and investments	880,701	782,556
Fair Value Measurements on a Recurring Basis \| Commercial paper \| Level 1
Assets
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis \| Commercial paper \| Level 2
Assets
Total unrestricted cash equivalents and short-term investments	587,030	762,546
Total restricted cash equivalents and investments	880,701	782,556
Fair Value Measurements on a Recurring Basis \| Commercial paper \| Level 3
Assets
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis \| Corporate bonds
Assets
Total unrestricted cash equivalents and short-term investments	104,112	70,231
Total restricted cash equivalents and investments	27,570	59,266
Fair Value Measurements on a Recurring Basis \| Corporate bonds \| Level 1
Assets
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis \| Corporate bonds \| Level 2
Assets
Total unrestricted cash equivalents and short-term investments	104,112	70,231
Total restricted cash equivalents and investments	27,570	59,266
Fair Value Measurements on a Recurring Basis \| Corporate bonds \| Level 3
Assets
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis \| U.S. government and agency securities
Assets
Total unrestricted cash equivalents and short-term investments	320,858	353,274
Total restricted cash equivalents and investments	455,108	465,857
Fair Value Measurements on a Recurring Basis \| U.S. government and agency securities \| Level 1
Assets
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis \| U.S. government and agency securities \| Level 2
Assets
Total unrestricted cash equivalents and short-term investments	320,858	353,274
Total restricted cash equivalents and investments	455,108	465,857
Fair Value Measurements on a Recurring Basis \| U.S. government and agency securities \| Level 3
Assets
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on Nonrecurring Basis \| Cash and Cash Equivalents and Short-Term Investments
Assets
Cash	324,200	132,500
Term deposits		2,200
Fair Value Measurements on Nonrecurring Basis \| Cash and Cash Equivalents and Short-Term Investments \| Money market funds
Assets
Short-term investments	$ 268,000	$ 304,700

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

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