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Information About Revenue and Geographic Areas (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total long-lived assets | $ 227,988 | $ 231,820
United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total long-lived assets | 168,251 | 166,413
All other countries |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total long-lived assets | $ 59,737 | $ 65,407

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- Definition Property Plant And Equipment, Net And Operating Lease Right Of Use Assets, Net + References No definition available. + Details
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Namespace Prefix: | fsly_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=us-gaap_NonUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |