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Stockholders' Equity - Warrants (Details) - $ / shares | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Class of Warrant or Right |  |
Warrant expiration date | 2023-10 |
Common Stock |  |
Class of Warrant or Right |  |
Warrants outstanding (in shares) | 13,013 | 13,013
Outstanding warrants exercise price, weighted-average (in USD per share) | $ 5.76 | $ 5.76

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- Definition Outstanding Warrants Exercise Price, Weighted-Average + References No definition available. + Details
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Namespace Prefix: | fivn_
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Balance Type: | na
Period Type: | instant

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- Definition Warrant Expiration Date1 + References No definition available. + Details
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Balance Type: | na
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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_
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- Definition Number of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Details
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Period Type: |