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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Commitments and Contingencies Disclosure [Abstract] |  |
Sales and use tax | $ 4.3 | $ 7.6

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- Definition Sales and Excise Tax Payable, Current, Excluding Normal Activity + References No definition available. + Details
Name: | fsly_SalesAndExciseTaxPayableCurrentExcludingNormalActivity
Namespace Prefix: | fsly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration