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Financial Instruments - Schedule of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Marketable securities: |  |
Amortized Cost | $ 598,163 |
Fair Value | 591,475 | $ 681,323
Level 1 securities: |  |
Restricted cash: |  |
Restricted cash, amortized cost | 10,755 |
Restricted cash, fair value | 10,755 | 10,823
Cash equivalents: |  |
Cash equivalents, amortized cost | 166,174 |
Cash and cash equivalents, fair value | 166,174 | 73,138
Level 1 securities: | Money market funds |  |
Cash equivalents: |  |
Cash equivalents, amortized cost | 166,174 |
Cash and cash equivalents, fair value | 166,174 | 73,138
Level 2 securities: |  |
Marketable securities: |  |
Amortized Cost | 598,163 |
Unrealized Gains | 0 |
Unrealized Losses | (6,688) |
Fair Value | 591,475 | 681,323
Level 2 securities: | Commercial paper |  |
Marketable securities: |  |
Amortized Cost | 127,113 |
Unrealized Gains | 0 |
Unrealized Losses | 0 |
Fair Value | 127,113 | 59,792
Level 2 securities: | Asset-backed securities |  |
Marketable securities: |  |
Amortized Cost | 28,317 |
Unrealized Gains | 0 |
Unrealized Losses | (90) |
Fair Value | 28,227 | 40,942
Level 2 securities: | Corporate bonds |  |
Marketable securities: |  |
Amortized Cost | 208,362 |
Unrealized Gains | 0 |
Unrealized Losses | (3,465) |
Fair Value | 204,897 | 237,402
Level 2 securities: | U.S. treasury securities |  |
Marketable securities: |  |
Amortized Cost | 181,344 |
Unrealized Gains | 0 |
Unrealized Losses | (2,164) |
Fair Value | 179,180 | 272,300
Level 2 securities: | Supranational bonds |  |
Marketable securities: |  |
Amortized Cost | 53,027 |
Unrealized Gains | 0 |
Unrealized Losses | (969) |
Fair Value | $ 52,058 | $ 70,887

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