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Cash and Cash Equivalents (Details) - Revolving Credit Facility $ in Millions | Dec. 31, 2017 USD ($) lender
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Cash and Cash Equivalents |
Unrestricted cash required to be deposited with lenders | $ | $ 25.0
Number of lenders | lender | 2

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- Definition Line of Credit Facility, Covenant, Unrestricted Cash Amount Deposited With Lenders + References No definition available. + Details
Name: | fivn_LineofCreditFacilityCovenantUnrestrictedCashAmountDepositedWithLenders
Namespace Prefix: | fivn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line of Credit Facility, Number of Lenders + References No definition available. + Details
Name: | fivn_LineofCreditFacilityNumberofLenders
Namespace Prefix: | fivn_
Data Type: | xbrli:integerItemType
Balance Type: | na
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
Name: | us-gaap_CashAndCashEquivalentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |