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Cash Equivalents and Investments - Schedule of Cash Equivalents and Short-Term Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost $ 1,409,669 $ 1,851,503
Unrestricted cash equivalents and short-term investments, Unrealized Gains 854 1,003
Unrestricted cash equivalents and short-term investments, Unrealized Losses (256) (542)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 1,410,267 1,851,964
Restricted cash equivalents and investments, Cost or Amortized Cost 1,715,073 1,541,848
Restricted cash equivalents and investments, Unrealized Gains 154 945
Restricted cash equivalents and investments, Unrealized Losses (561) (625)
Restricted cash equivalents and investments, Estimated Fair Value 1,714,666 1,542,168
Unrestricted and restricted cash equivalents and investments, Cost or Amortized Cost 3,124,742 3,393,351
Unrestricted and restricted cash equivalents and investments, Unrealized Gains 1,008 1,948
Unrestricted and restricted cash equivalents and investments, Unrealized Losses (817) (1,167)
Unrestricted and restricted cash equivalents and investments, Estimated Fair Value 3,124,933 3,394,132
Cash 381,900 132,500
Cash and cash equivalents and short-term investments 1,800,000 2,000,000
Money market funds    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 206,472 189,839
Unrestricted cash equivalents and short-term investments, Unrealized Gains 0 0
Unrestricted cash equivalents and short-term investments, Unrealized Losses 0 0
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 206,472 189,839
Restricted cash equivalents and investments, Cost or Amortized Cost 18,310 42,699
Restricted cash equivalents and investments, Unrealized Gains 0 0
Restricted cash equivalents and investments, Unrealized Losses 0 0
Restricted cash equivalents and investments, Estimated Fair Value 18,310 42,699
Money market deposit accounts    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 285,033 304,716
Unrestricted cash equivalents and short-term investments, Unrealized Gains 0 0
Unrestricted cash equivalents and short-term investments, Unrealized Losses 0 0
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 285,033 304,716
Term deposits    
Cash and Cash Equivalents [Line Items]    
Restricted cash equivalents and investments, Cost or Amortized Cost   2,194
Restricted cash equivalents and investments, Unrealized Gains   0
Restricted cash equivalents and investments, Unrealized Losses   0
Restricted cash equivalents and investments, Estimated Fair Value   2,194
Certificates of deposit    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 162,345 171,352
Unrestricted cash equivalents and short-term investments, Unrealized Gains 54 150
Unrestricted cash equivalents and short-term investments, Unrealized Losses (7) (144)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 162,392 171,358
Restricted cash equivalents and investments, Cost or Amortized Cost 222,265 189,694
Restricted cash equivalents and investments, Unrealized Gains 55 144
Restricted cash equivalents and investments, Unrealized Losses (17) (242)
Restricted cash equivalents and investments, Estimated Fair Value 222,303 189,596
Commercial paper    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 369,833 762,405
Unrestricted cash equivalents and short-term investments, Unrealized Gains 44 529
Unrestricted cash equivalents and short-term investments, Unrealized Losses (190) (388)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 369,687 762,546
Restricted cash equivalents and investments, Cost or Amortized Cost 949,826 782,491
Restricted cash equivalents and investments, Unrealized Gains 60 433
Restricted cash equivalents and investments, Unrealized Losses (474) (368)
Restricted cash equivalents and investments, Estimated Fair Value 949,412 782,556
Corporate bonds    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 159,439 70,207
Unrestricted cash equivalents and short-term investments, Unrealized Gains 740 29
Unrestricted cash equivalents and short-term investments, Unrealized Losses (11) (5)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 160,168 70,231
Restricted cash equivalents and investments, Cost or Amortized Cost 24,404 59,254
Restricted cash equivalents and investments, Unrealized Gains 1 19
Restricted cash equivalents and investments, Unrealized Losses (2) (7)
Restricted cash equivalents and investments, Estimated Fair Value 24,403 59,266
U.S. government and agency securities    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 226,547 352,984
Unrestricted cash equivalents and short-term investments, Unrealized Gains 16 295
Unrestricted cash equivalents and short-term investments, Unrealized Losses (48) (5)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 226,515 353,274
Restricted cash equivalents and investments, Cost or Amortized Cost 500,268 465,516
Restricted cash equivalents and investments, Unrealized Gains 38 349
Restricted cash equivalents and investments, Unrealized Losses (68) (8)
Restricted cash equivalents and investments, Estimated Fair Value $ 500,238 $ 465,857