v3.25.4
Cash Equivalents and Investments- Schedule of Cash Equivalents and Short-Term Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost $ 1,396,358 $ 1,851,503
Unrestricted cash equivalents and short-term investments, Unrealized Gains 1,621 1,003
Unrestricted cash equivalents and short-term investments, Unrealized Losses (8) (542)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 1,397,971 1,851,964
Restricted cash equivalents and investments, Cost or Amortized Cost 1,932,159 1,541,848
Restricted cash equivalents and investments, Unrealized Gains 939 945
Restricted cash equivalents and investments, Unrealized Losses 0 (625)
Restricted cash equivalents and investments, Estimated Fair Value 1,933,098 1,542,168
Unrestricted and restricted cash equivalents and investments, Cost or Amortized Cost 3,328,517 3,393,351
Unrestricted and restricted cash equivalents and investments, Unrealized Gains 2,560 1,948
Unrestricted and restricted cash equivalents and investments, Unrealized Losses (8) (1,167)
Unrestricted and restricted cash equivalents and investments, Estimated Fair Value 3,331,069 3,394,132
Cash 439,200 132,500
Cash and cash equivalents and short-term investments 1,800,000 2,000,000
Restricted cash 3,000  
Restricted cash and cash equivalents and restricted short-term investments 1,900,000 1,500,000
Money market funds    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 276,077 189,839
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 276,077 189,839
Restricted cash equivalents and investments, Cost or Amortized Cost 47,264 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 47,264 42,699
Money market deposit accounts    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 360,127 304,716
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 360,127 304,716
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 143,325 171,352
Unrestricted cash equivalents and short-term investments, Unrealized Gains 146 150
Unrestricted cash equivalents and short-term investments, Unrealized Losses 0 (144)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 143,471 171,358
Restricted cash equivalents and investments, Cost or Amortized Cost 104,310 189,694
Restricted cash equivalents and investments, Unrealized Gains 60 144
Restricted cash equivalents and investments, Unrealized Losses 0 (242)
Restricted cash equivalents and investments, Estimated Fair Value 104,370 189,596
Commercial paper    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 216,420 762,405
Unrestricted cash equivalents and short-term investments, Unrealized Gains 105 529
Unrestricted cash equivalents and short-term investments, Unrealized Losses 0 (388)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 216,525 762,546
Restricted cash equivalents and investments, Cost or Amortized Cost 921,902 782,491
Restricted cash equivalents and investments, Unrealized Gains 462 433
Restricted cash equivalents and investments, Unrealized Losses 0 (368)
Restricted cash equivalents and investments, Estimated Fair Value 922,364 782,556
Corporate bonds    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 266,199 70,207
Unrestricted cash equivalents and short-term investments, Unrealized Gains 1,300 29
Unrestricted cash equivalents and short-term investments, Unrealized Losses (8) (5)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 267,491 70,231
Restricted cash equivalents and investments, Cost or Amortized Cost 15,022 59,254
Restricted cash equivalents and investments, Unrealized Gains 15 19
Restricted cash equivalents and investments, Unrealized Losses 0 (7)
Restricted cash equivalents and investments, Estimated Fair Value 15,037 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 134,210  
Unrestricted cash equivalents and short-term investments, Unrealized Gains 70  
Unrestricted cash equivalents and short-term investments, Unrealized Losses 0  
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 134,280  
Restricted cash equivalents and investments, Cost or Amortized Cost 843,661  
Restricted cash equivalents and investments, Unrealized Gains 402  
Restricted cash equivalents and investments, Unrealized Losses 0  
Restricted cash equivalents and investments, Estimated Fair Value $ 844,063  
U.S. government and agency securities    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost   352,984
Unrestricted cash equivalents and short-term investments, Unrealized Gains   295
Unrestricted cash equivalents and short-term investments, Unrealized Losses   (5)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value   353,274
Restricted cash equivalents and investments, Cost or Amortized Cost   465,516
Restricted cash equivalents and investments, Unrealized Gains   349
Restricted cash equivalents and investments, Unrealized Losses   (8)
Restricted cash equivalents and investments, Estimated Fair Value   $ 465,857