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Fair Value Measurements - Schedule of Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Fair value | $ 964,094 | $ 995,252
Foreign currency derivative contracts |  | 185
Total | 1,339,895 | 1,480,718
Liabilities: |  |
Foreign currency derivative contracts | 201 | 11
Total | 201 | 11
Money market funds |  |
Assets: |  |
Cash equivalents | 350,803 | 335,284
U.S. government treasuries |  |
Assets: |  |
Cash equivalents | 24,998 | 149,997
Short-term marketable securities | U.S. government treasuries |  |
Assets: |  |
Fair value | 472,214 | 878,938
Short-term marketable securities | U.S. government agency securities |  |
Assets: |  |
Fair value | 15,003 | 25,217
Short-term marketable securities | Corporate debt securities |  |
Assets: |  |
Fair value | 61,182 | 27,180
Short-term marketable securities | Commercial paper |  |
Assets: |  |
Fair value | 96,223 | 31,218
Long-term marketable securities | U.S. government treasuries |  |
Assets: |  |
Fair value | 299,069 | 2,561
Long-term marketable securities | Corporate debt securities |  |
Assets: |  |
Fair value | 20,403 | 30,138
Level 1 |  |
Assets: |  |
Foreign currency derivative contracts |  | 0
Total | 1,147,084 | 1,366,780
Liabilities: |  |
Foreign currency derivative contracts | 0 | 0
Total | 0 | 0
Level 1 | Money market funds |  |
Assets: |  |
Cash equivalents | 350,803 | 335,284
Level 1 | U.S. government treasuries |  |
Assets: |  |
Cash equivalents | 24,998 | 149,997
Level 1 | Short-term marketable securities | U.S. government treasuries |  |
Assets: |  |
Fair value | 472,214 | 878,938
Level 1 | Short-term marketable securities | U.S. government agency securities |  |
Assets: |  |
Fair value | 0 | 0
Level 1 | Short-term marketable securities | Corporate debt securities |  |
Assets: |  |
Fair value | 0 | 0
Level 1 | Short-term marketable securities | Commercial paper |  |
Assets: |  |
Fair value | 0 | 0
Level 1 | Long-term marketable securities | U.S. government treasuries |  |
Assets: |  |
Fair value | 299,069 | 2,561
Level 1 | Long-term marketable securities | Corporate debt securities |  |
Assets: |  |
Fair value | 0 | 0
Level 2 |  |
Assets: |  |
Foreign currency derivative contracts |  | 185
Total | 192,811 | 113,938
Liabilities: |  |
Foreign currency derivative contracts | 201 | 11
Total | 201 | 11
Level 2 | Money market funds |  |
Assets: |  |
Cash equivalents | 0 | 0
Level 2 | U.S. government treasuries |  |
Assets: |  |
Cash equivalents | 0 | 0
Level 2 | Short-term marketable securities | U.S. government treasuries |  |
Assets: |  |
Fair value | 0 | 0
Level 2 | Short-term marketable securities | U.S. government agency securities |  |
Assets: |  |
Fair value | 15,003 | 25,217
Level 2 | Short-term marketable securities | Corporate debt securities |  |
Assets: |  |
Fair value | 61,182 | 27,180
Level 2 | Short-term marketable securities | Commercial paper |  |
Assets: |  |
Fair value | 96,223 | 31,218
Level 2 | Long-term marketable securities | U.S. government treasuries |  |
Assets: |  |
Fair value | 0 | 0
Level 2 | Long-term marketable securities | Corporate debt securities |  |
Assets: |  |
Fair value | 20,403 | 30,138
Level 3 |  |
Assets: |  |
Foreign currency derivative contracts |  | 0
Total | 0 | 0
Liabilities: |  |
Foreign currency derivative contracts | 0 | 0
Total | 0 | 0
Level 3 | Money market funds |  |
Assets: |  |
Cash equivalents | 0 | 0
Level 3 | U.S. government treasuries |  |
Assets: |  |
Cash equivalents | 0 | 0
Level 3 | Short-term marketable securities | U.S. government treasuries |  |
Assets: |  |
Fair value | 0 | 0
Level 3 | Short-term marketable securities | U.S. government agency securities |  |
Assets: |  |
Fair value | 0 | 0
Level 3 | Short-term marketable securities | Corporate debt securities |  |
Assets: |  |
Fair value | 0 | 0
Level 3 | Short-term marketable securities | Commercial paper |  |
Assets: |  |
Fair value | 0 | 0
Level 3 | Long-term marketable securities | U.S. government treasuries |  |
Assets: |  |
Fair value | 0 | 0
Level 3 | Long-term marketable securities | Corporate debt securities |  |
Assets: |  |
Fair value | $ 0 | $ 0

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