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Supplemental Financial Statement Information - Summary of Cash Equivalents and Short-Term Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost $ 1,709,653 $ 2,149,289
Unrestricted cash equivalents and investments, Unrealized Gains 184 161
Unrestricted cash equivalents and investments, Unrealized Losses (4,141) (417)
Unrestricted cash equivalents and investments, Estimated Fair Value 1,705,696 2,149,033
Restricted cash equivalents and investments, Cost or Amortized Cost 1,119,311 1,065,317
Restricted cash equivalents and investments, Unrealized Gains 96 78
Restricted cash equivalents and investments, Unrealized Losses (2,303) (379)
Restricted cash equivalents and investments, Estimated Fair Value 1,117,104 1,065,016
Unrestricted and restricted cash equivalents and investments, Cost or Amortized Cost 2,828,964 3,214,606
Unrestricted and restricted cash equivalents and investments, Unrealized Gains 280 239
Unrestricted and restricted cash equivalents and investments, Unrealized Losses (6,444) (796)
Total financial assets 2,822,800 3,214,049
Cash 72,800 104,800
Marketable equity securities 4,900  
Cash and cash equivalents and short-term investments 1,800,000 2,300,000
Restricted cash 56,100 53,700
Restricted cash and cash equivalents and restricted short-term investments 1,200,000 1,100,000
Money market funds    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost 1,885 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 1,885 22,250
Restricted cash equivalents and investments, Cost or Amortized Cost 91,231 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 91,231 20,161
Money market deposit accounts    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost 51,318 330,252
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 51,318 330,252
Term deposits    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost 15,000 385,000
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 15,000 385,000
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 430,038 505,562
Unrestricted cash equivalents and investments, Unrealized Gains 122 25
Unrestricted cash equivalents and investments, Unrealized Losses (801) (149)
Unrestricted cash equivalents and investments, Estimated Fair Value 429,359 505,438
Restricted cash equivalents and investments, Cost or Amortized Cost 269,915 421,243
Restricted cash equivalents and investments, Unrealized Gains 52 35
Restricted cash equivalents and investments, Unrealized Losses (680) (134)
Restricted cash equivalents and investments, Estimated Fair Value 269,287 421,144
Commercial paper    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost 1,085,841 806,446
Unrestricted cash equivalents and investments, Unrealized Gains 62 132
Unrestricted cash equivalents and investments, Unrealized Losses (2,631) (190)
Unrestricted cash equivalents and investments, Estimated Fair Value 1,083,272 806,388
Restricted cash equivalents and investments, Cost or Amortized Cost 660,339 523,616
Restricted cash equivalents and investments, Unrealized Gains 44 43
Restricted cash equivalents and investments, Unrealized Losses (1,190) (169)
Restricted cash equivalents and investments, Estimated Fair Value 659,193 523,490
Corporate bonds    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost 85,821 99,779
Unrestricted cash equivalents and investments, Unrealized Gains 0 4
Unrestricted cash equivalents and investments, Unrealized Losses (675) (78)
Unrestricted cash equivalents and investments, Estimated Fair Value 85,146 99,705
Restricted cash equivalents and investments, Cost or Amortized Cost 29,158 63,506
Restricted cash equivalents and investments, Unrealized Gains 0 0
Restricted cash equivalents and investments, Unrealized Losses (151) (48)
Restricted cash equivalents and investments, Estimated Fair Value 29,007 63,458
U.S. government securities    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and investments, Cost or Amortized Cost 39,750  
Unrestricted cash equivalents and investments, Unrealized Gains 0  
Unrestricted cash equivalents and investments, Unrealized Losses (34)  
Unrestricted cash equivalents and investments, Estimated Fair Value 39,716  
Restricted cash equivalents and investments, Cost or Amortized Cost 63,622 31,745
Restricted cash equivalents and investments, Unrealized Gains 0 0
Restricted cash equivalents and investments, Unrealized Losses (282) (28)
Restricted cash equivalents and investments, Estimated Fair Value $ 63,340 $ 31,717