v3.25.1
Cash Equivalents and Investments - Schedule of Cash Equivalents and Short-Term Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost $ 1,829,299 $ 1,851,503
Unrestricted cash equivalents and short-term investments, Unrealized Gains 946 1,003
Unrestricted cash equivalents and short-term investments, Unrealized Losses (447) (542)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 1,829,798 1,851,964
Restricted cash equivalents and investments, Cost or Amortized Cost 1,636,074 1,541,848
Restricted cash equivalents and investments, Unrealized Gains 618 945
Restricted cash equivalents and investments, Unrealized Losses (770) (625)
Restricted cash equivalents and investments, Estimated Fair Value 1,635,922 1,542,168
Unrestricted and restricted cash equivalents and investments, Cost or Amortized Cost 3,465,373 3,393,351
Unrestricted and restricted cash equivalents and investments, Unrealized Gains 1,564 1,948
Unrestricted and restricted cash equivalents and investments, Unrealized Losses (1,217) (1,167)
Unrestricted and restricted cash equivalents and investments, Estimated Fair Value 3,465,720 3,394,132
Cash 324,200 132,500
Cash and cash equivalents and short-term investments 2,200,000 2,000,000
Money market funds    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 348,269 189,839
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 348,269 189,839
Restricted cash equivalents and investments, Cost or Amortized Cost 13,400 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 13,400 42,699
Money market deposit accounts    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 268,049 304,716
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 268,049 304,716
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 201,366 171,352
Unrestricted cash equivalents and short-term investments, Unrealized Gains 139 150
Unrestricted cash equivalents and short-term investments, Unrealized Losses (25) (144)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 201,480 171,358
Restricted cash equivalents and investments, Cost or Amortized Cost 258,995 189,694
Restricted cash equivalents and investments, Unrealized Gains 177 144
Restricted cash equivalents and investments, Unrealized Losses (29) (242)
Restricted cash equivalents and investments, Estimated Fair Value 259,143 189,596
Commercial paper    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 587,200 762,405
Unrestricted cash equivalents and short-term investments, Unrealized Gains 226 529
Unrestricted cash equivalents and short-term investments, Unrealized Losses (396) (388)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 587,030 762,546
Restricted cash equivalents and investments, Cost or Amortized Cost 881,205 782,491
Restricted cash equivalents and investments, Unrealized Gains 211 433
Restricted cash equivalents and investments, Unrealized Losses (715) (368)
Restricted cash equivalents and investments, Estimated Fair Value 880,701 782,556
Corporate bonds    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 103,745 70,207
Unrestricted cash equivalents and short-term investments, Unrealized Gains 380 29
Unrestricted cash equivalents and short-term investments, Unrealized Losses (13) (5)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 104,112 70,231
Restricted cash equivalents and investments, Cost or Amortized Cost 27,559 59,254
Restricted cash equivalents and investments, Unrealized Gains 15 19
Restricted cash equivalents and investments, Unrealized Losses (4) (7)
Restricted cash equivalents and investments, Estimated Fair Value 27,570 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 320,670 352,984
Unrestricted cash equivalents and short-term investments, Unrealized Gains 201 295
Unrestricted cash equivalents and short-term investments, Unrealized Losses (13) (5)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 320,858 353,274
Restricted cash equivalents and investments, Cost or Amortized Cost 454,915 465,516
Restricted cash equivalents and investments, Unrealized Gains 215 349
Restricted cash equivalents and investments, Unrealized Losses (22) (8)
Restricted cash equivalents and investments, Estimated Fair Value $ 455,108 $ 465,857