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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted and restricted cash equivalents and investments | $ 3,073,433 | $ 3,214,049
Fair Value Measurements on a Recurring Basis |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 1,863,288 | 1,433,781
Total restricted cash equivalents and investments | 889,830 | 1,059,969
Total unrestricted and restricted cash equivalents and investments | 2,753,118 | 2,493,750
Fair Value Measurements on a Recurring Basis | Level 1 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 20,654 | 22,250
Total restricted cash equivalents and investments | 11,868 | 20,161
Total unrestricted and restricted cash equivalents and investments | 32,522 | 42,411
Fair Value Measurements on a Recurring Basis | Level 2 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 1,842,634 | 1,411,531
Total restricted cash equivalents and investments | 877,962 | 1,039,808
Total unrestricted and restricted cash equivalents and investments | 2,720,596 | 2,451,339
Fair Value Measurements on a Recurring Basis | Level 3 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 0 | 0
Total restricted cash equivalents and investments | 0 | 0
Total unrestricted and restricted cash equivalents and investments | 0 | 0
Fair Value Measurements on a Recurring Basis | Money market funds |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 10,824 | 22,250
Total restricted cash equivalents and investments | 11,868 | 20,161
Fair Value Measurements on a Recurring Basis | Money market funds | Level 1 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 10,824 | 22,250
Total restricted cash equivalents and investments | 11,868 | 20,161
Fair Value Measurements on a Recurring Basis | Money market funds | Level 2 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 0 | 0
Total restricted cash equivalents and investments | 0 | 0
Fair Value Measurements on a Recurring Basis | Money market funds | Level 3 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 0 | 0
Total restricted cash equivalents and investments | 0 | 0
Fair Value Measurements on a Recurring Basis | Certificates of deposit |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 480,128 | 505,438
Total restricted cash equivalents and investments | 281,080 | 421,144
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 1 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 0 | 0
Total restricted cash equivalents and investments | 0 | 0
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 2 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 480,128 | 505,438
Total restricted cash equivalents and investments | 281,080 | 421,144
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 3 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 0 | 0
Total restricted cash equivalents and investments | 0 | 0
Fair Value Measurements on a Recurring Basis | Commercial paper |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 1,194,329 | 806,388
Total restricted cash equivalents and investments | 485,042 | 523,489
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 1 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 0 | 0
Total restricted cash equivalents and investments | 0 | 0
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 2 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 1,194,329 | 806,388
Total restricted cash equivalents and investments | 485,042 | 523,489
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 3 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 0 | 0
Total restricted cash equivalents and investments | 0 | 0
Fair Value Measurements on a Recurring Basis | Corporate bonds |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 165,082 | 99,705
Total restricted cash equivalents and investments | 65,742 | 63,458
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 1 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 0 | 0
Total restricted cash equivalents and investments | 0 | 0
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 2 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 165,082 | 99,705
Total restricted cash equivalents and investments | 65,742 | 63,458
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 3 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 0 | 0
Total restricted cash equivalents and investments | 0 | 0
Fair Value Measurements on a Recurring Basis | Marketable equity securities |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 9,830 |
Fair Value Measurements on a Recurring Basis | Marketable equity securities | Level 1 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 9,830 |
Fair Value Measurements on a Recurring Basis | Marketable equity securities | Level 2 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 0 |
Fair Value Measurements on a Recurring Basis | Marketable equity securities | Level 3 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 0 |
Fair Value Measurements on a Recurring Basis | U.S. government securities |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 3,095 |
Total restricted cash equivalents and investments | 46,098 | 31,717
Fair Value Measurements on a Recurring Basis | U.S. government securities | Level 1 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 0 |
Total restricted cash equivalents and investments | 0 | 0
Fair Value Measurements on a Recurring Basis | U.S. government securities | Level 2 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 3,095 |
Total restricted cash equivalents and investments | 46,098 | 31,717
Fair Value Measurements on a Recurring Basis | U.S. government securities | Level 3 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and short-term investments | 0 |
Total restricted cash equivalents and investments | $ 0 | $ 0

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