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Supplemental Financial Statement Information - Summary of Cash Equivalents and Short-Term Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost $ 2,184,565 $ 2,149,289
Unrestricted cash equivalents and investments, Unrealized Gains 16 161
Unrestricted cash equivalents and investments, Unrealized Losses (6,024) (417)
Unrestricted cash equivalents and investments, Estimated Fair Value 2,178,557 2,149,033
Restricted cash equivalents and investments, Cost or Amortized Cost 897,862 1,065,317
Restricted cash equivalents and investments, Unrealized Gains 3 78
Restricted cash equivalents and investments, Unrealized Losses (2,989) (379)
Restricted cash equivalents and investments, Estimated Fair Value 894,876 1,065,016
Unrestricted and restricted cash equivalents and investments, Cost or Amortized Cost 3,082,427 3,214,606
Unrestricted and restricted cash equivalents and investments, Unrealized Gains 19 239
Unrestricted and restricted cash equivalents and investments, Unrealized Losses (9,013) (796)
Total unrestricted and restricted cash equivalents and investments 3,073,433 3,214,049
Money market funds    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost 10,824 22,250
Unrestricted cash equivalents and investments, Unrealized Gains 0 0
Unrestricted cash equivalents and investments, Unrealized Losses 0 0
Unrestricted cash equivalents and investments, Estimated Fair Value 10,824 22,250
Restricted cash equivalents and investments, Cost or Amortized Cost 11,868 20,161
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 11,868 20,161
Money market deposit accounts    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost 115,099 330,252
Unrestricted cash equivalents and investments, Unrealized Gains 0 0
Unrestricted cash equivalents and investments, Unrealized Losses 0 0
Unrestricted cash equivalents and investments, Estimated Fair Value 115,099 330,252
Term deposits    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost 210,000 385,000
Unrestricted cash equivalents and investments, Unrealized Gains 0 0
Unrestricted cash equivalents and investments, Unrealized Losses 0 0
Unrestricted cash equivalents and investments, Estimated Fair Value 210,000 385,000
Restricted cash equivalents and investments, Cost or Amortized Cost 5,046 5,046
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 5,046 5,046
Certificates of deposit    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost 481,555 505,562
Unrestricted cash equivalents and investments, Unrealized Gains 13 25
Unrestricted cash equivalents and investments, Unrealized Losses (1,440) (149)
Unrestricted cash equivalents and investments, Estimated Fair Value 480,128 505,438
Restricted cash equivalents and investments, Cost or Amortized Cost 281,852 421,243
Restricted cash equivalents and investments, Unrealized Gains 3 35
Restricted cash equivalents and investments, Unrealized Losses (775) (134)
Restricted cash equivalents and investments, Estimated Fair Value 281,080 421,144
Commercial paper    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost 1,198,296 806,446
Unrestricted cash equivalents and investments, Unrealized Gains 3 132
Unrestricted cash equivalents and investments, Unrealized Losses (3,970) (190)
Unrestricted cash equivalents and investments, Estimated Fair Value 1,194,329 806,388
Restricted cash equivalents and investments, Cost or Amortized Cost 486,896 523,616
Restricted cash equivalents and investments, Unrealized Gains 0 43
Restricted cash equivalents and investments, Unrealized Losses (1,854) (169)
Restricted cash equivalents and investments, Estimated Fair Value 485,042 523,490
Corporate bonds    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost 165,693 99,779
Unrestricted cash equivalents and investments, Unrealized Gains 0 4
Unrestricted cash equivalents and investments, Unrealized Losses (611) (78)
Unrestricted cash equivalents and investments, Estimated Fair Value 165,082 99,705
Restricted cash equivalents and investments, Cost or Amortized Cost 65,900 63,506
Restricted cash equivalents and investments, Unrealized Gains 0 0
Restricted cash equivalents and investments, Unrealized Losses (158) (48)
Restricted cash equivalents and investments, Estimated Fair Value 65,742 63,458
U.S. government securities    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost 3,098  
Unrestricted cash equivalents and investments, Unrealized Gains 0  
Unrestricted cash equivalents and investments, Unrealized Losses (3)  
Unrestricted cash equivalents and investments, Estimated Fair Value 3,095  
Restricted cash equivalents and investments, Cost or Amortized Cost 46,300 31,745
Restricted cash equivalents and investments, Unrealized Gains 0 0
Restricted cash equivalents and investments, Unrealized Losses (202) (28)
Restricted cash equivalents and investments, Estimated Fair Value $ 46,098 $ 31,717