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Commitment and Contingencies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |  |
Cost and expenses related to bandwidth and other co-location commitments | $ 10.6 | $ 8.3

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- Definition Long-Term Purchase Commitment Costs And Expenses + References No definition available. + Details
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Namespace Prefix: | cloud_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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