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Cash, Concentration of Credit Risk and Fair Value of Financial Instruments - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021
--- | --- | --- | ---
Assets: |  |  |
Total | $ 912,268 | $ 948,569 |
Amount of commercial paper included in cash and cash equivalents | 833,533 | 706,282 | $ 410,144
U.S. government securities |  |  |
Assets: |  |  |
Securities | 43,188 | 51,301 |
Corporate bonds, asset backed and other securities |  |  |
Assets: |  |  |
Securities | 13,895 | 33,091 |
Money market and demand accounts |  |  |
Assets: |  |  |
Cash and cash equivalents | 845,192 | 705,725 |
Commercial Paper |  |  |
Assets: |  |  |
Cash and cash equivalents | 9,993 | 158,452 |
Amount of commercial paper included in cash and cash equivalents | 0 | 7,500 |
Level 1 |  |  |
Assets: |  |  |
Total | 845,192 | 705,725 |
Level 1 | U.S. government securities |  |  |
Assets: |  |  |
Securities | 0 | 0 |
Level 1 | Corporate bonds, asset backed and other securities |  |  |
Assets: |  |  |
Securities | 0 | 0 |
Level 1 | Money market and demand accounts |  |  |
Assets: |  |  |
Cash and cash equivalents | 845,192 | 705,725 |
Level 1 | Commercial Paper |  |  |
Assets: |  |  |
Cash and cash equivalents | 0 | 0 |
Level 2 |  |  |
Assets: |  |  |
Total | 67,076 | 242,844 |
Level 2 | U.S. government securities |  |  |
Assets: |  |  |
Securities | 43,188 | 51,301 |
Level 2 | Corporate bonds, asset backed and other securities |  |  |
Assets: |  |  |
Securities | 13,895 | 33,091 |
Level 2 | Money market and demand accounts |  |  |
Assets: |  |  |
Cash and cash equivalents | 0 | 0 |
Level 2 | Commercial Paper |  |  |
Assets: |  |  |
Cash and cash equivalents | 9,993 | 158,452 |
Level 3 |  |  |
Assets: |  |  |
Total | 0 | 0 |
Level 3 | U.S. government securities |  |  |
Assets: |  |  |
Securities | 0 | 0 |
Level 3 | Corporate bonds, asset backed and other securities |  |  |
Assets: |  |  |
Securities | 0 | 0 |
Level 3 | Money market and demand accounts |  |  |
Assets: |  |  |
Cash and cash equivalents | 0 | 0 |
Level 3 | Commercial Paper |  |  |
Assets: |  |  |
Cash and cash equivalents | $ 0 | $ 0 |

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