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Fair Value Measurements - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Assets    
Cash $ 381,900 $ 132,500
Short-term investments 878,319 1,225,124
Cash and cash equivalents and short-term investments 1,800,000 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 1,125,234 1,547,248
Total restricted cash equivalents and investments 1,714,666 1,539,974
Total financial assets 2,839,900 3,087,222
Fair Value Measurements on a Recurring Basis | Level 1    
Assets    
Total unrestricted cash equivalents and short-term investments 206,472 189,839
Total restricted cash equivalents and investments 18,310 42,699
Total financial assets 224,782 232,538
Fair Value Measurements on a Recurring Basis | Level 2    
Assets    
Total unrestricted cash equivalents and short-term investments 918,762 1,357,409
Total restricted cash equivalents and investments 1,696,356 1,497,275
Total financial assets 2,615,118 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 206,472 189,839
Total restricted cash equivalents and investments 18,310 42,699
Fair Value Measurements on a Recurring Basis | Money market funds | Level 1    
Assets    
Total unrestricted cash equivalents and short-term investments 206,472 189,839
Total restricted cash equivalents and investments 18,310 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 162,392 171,358
Total restricted cash equivalents and investments 222,303 189,596
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 162,392 171,358
Total restricted cash equivalents and investments 222,303 189,596
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 369,687 762,546
Total restricted cash equivalents and investments 949,412 782,556
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 369,687 762,546
Total restricted cash equivalents and investments 949,412 782,556
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 160,168 70,231
Total restricted cash equivalents and investments 24,403 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 160,168 70,231
Total restricted cash equivalents and investments 24,403 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 226,515 353,274
Total restricted cash equivalents and investments 500,238 465,857
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 226,515 353,274
Total restricted cash equivalents and investments 500,238 465,857
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 381,900 132,500
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 $ 285,000 $ 304,700