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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
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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

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