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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financial Assets: |  |
Marketable Securities: | $ 1,464,681 | $ 1,283,473
Commercial paper |  |
Financial Assets: |  |
Marketable Securities: | 219,879 | 151,356
Certificates of deposit |  |
Financial Assets: |  |
Marketable Securities: | 72,679 | 14,569
Non-U.S. government securities |  |
Financial Assets: |  |
Marketable Securities: | 7,959 | 8,054
Fair Value, Recurring |  |
Financial Assets: |  |
Total financial assets | 1,673,357 | 1,525,044
Fair Value, Recurring | Money market funds |  |
Financial Assets: |  |
Cash equivalents: | 182,572 | 241,571
Fair Value, Recurring | Commercial paper |  |
Financial Assets: |  |
Cash equivalents: | 25,314 |
Marketable Securities: | 219,879 | 151,356
Fair Value, Recurring | Corporate debt securities |  |
Financial Assets: |  |
Cash equivalents: | 790 |
Marketable Securities: | 985,985 | 1,032,052
Fair Value, Recurring | Certificates of deposit |  |
Financial Assets: |  |
Marketable Securities: | 72,679 | 14,569
Fair Value, Recurring | U.S. government treasury securities |  |
Financial Assets: |  |
Marketable Securities: | 178,179 | 77,442
Fair Value, Recurring | Non-U.S. government securities |  |
Financial Assets: |  |
Marketable Securities: | 7,959 | 8,054
Fair Value, Recurring | Level 1 |  |
Financial Assets: |  |
Total financial assets | 182,572 | 241,571
Fair Value, Recurring | Level 1 | Money market funds |  |
Financial Assets: |  |
Cash equivalents: | 182,572 | 241,571
Fair Value, Recurring | Level 1 | Commercial paper |  |
Financial Assets: |  |
Cash equivalents: | 0 |
Marketable Securities: | 0 | 0
Fair Value, Recurring | Level 1 | Corporate debt securities |  |
Financial Assets: |  |
Cash equivalents: | 0 |
Marketable Securities: | 0 | 0
Fair Value, Recurring | Level 1 | Certificates of deposit |  |
Financial Assets: |  |
Marketable Securities: | 0 | 0
Fair Value, Recurring | Level 1 | U.S. government treasury securities |  |
Financial Assets: |  |
Marketable Securities: | 0 | 0
Fair Value, Recurring | Level 1 | Non-U.S. government securities |  |
Financial Assets: |  |
Marketable Securities: | 0 | 0
Fair Value, Recurring | Level 2 |  |
Financial Assets: |  |
Total financial assets | 1,490,785 | 1,283,473
Fair Value, Recurring | Level 2 | Money market funds |  |
Financial Assets: |  |
Cash equivalents: | 0 | 0
Fair Value, Recurring | Level 2 | Commercial paper |  |
Financial Assets: |  |
Cash equivalents: | 25,314 |
Marketable Securities: | 219,879 | 151,356
Fair Value, Recurring | Level 2 | Corporate debt securities |  |
Financial Assets: |  |
Cash equivalents: | 790 |
Marketable Securities: | 985,985 | 1,032,052
Fair Value, Recurring | Level 2 | Certificates of deposit |  |
Financial Assets: |  |
Marketable Securities: | 72,679 | 14,569
Fair Value, Recurring | Level 2 | U.S. government treasury securities |  |
Financial Assets: |  |
Marketable Securities: | 178,179 | 77,442
Fair Value, Recurring | Level 2 | Non-U.S. government securities |  |
Financial Assets: |  |
Marketable Securities: | 7,959 | 8,054
Fair Value, Recurring | Level 3 |  |
Financial Assets: |  |
Total financial assets | 0 | 0
Fair Value, Recurring | Level 3 | Money market funds |  |
Financial Assets: |  |
Cash equivalents: | 0 | 0
Fair Value, Recurring | Level 3 | Commercial paper |  |
Financial Assets: |  |
Cash equivalents: | 0 |
Marketable Securities: | 0 | 0
Fair Value, Recurring | Level 3 | Corporate debt securities |  |
Financial Assets: |  |
Cash equivalents: | 0 |
Marketable Securities: | 0 | 0
Fair Value, Recurring | Level 3 | Certificates of deposit |  |
Financial Assets: |  |
Marketable Securities: | 0 | 0
Fair Value, Recurring | Level 3 | U.S. government treasury securities |  |
Financial Assets: |  |
Marketable Securities: | 0 | 0
Fair Value, Recurring | Level 3 | Non-U.S. government securities |  |
Financial Assets: |  |
Marketable Securities: | $ 0 | $ 0

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