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Debt (Details) - Line of Credit - Credit Facility - Revolving Credit Facility - USD ($) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 04, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Line of Credit Facility [Line Items] |  |  |
Revolving credit facility, maximum borrowing capacity | $ 25,000,000.0 |  |
Arrears paid on average unused portion | 0.25% |  |
Outstanding balance of credit facility, amount requiring covenant compliance | $ 5,000,000.0 |  |
Borrowings outstanding |  | $ 0 | $ 0
LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 2.00% |  |
Prime Rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 1.00% |  |

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- Definition Line Of Credit Facility, Amount Outstanding at End of Period Requiring Covenant Compliance + References No definition available. + Details
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Namespace Prefix: | tenb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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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- Definition Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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- Details
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Period Type: |