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Business and Summary of Significant Accounting Policies - Activity of Deferred Contract Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Capitalized Contract Cost [Roll Forward]
Beginning balance	$ 50,805	$ 36,252	$ 50,176	$ 30,118
Capitalization of contract acquisition costs	7,138	9,032	16,985	21,194
Amortization of deferred contract acquisition costs	(5,059)	(3,891)	(14,277)	(9,919)
Ending balance	$ 52,884	$ 41,393	$ 52,884	$ 41,393

X

- Definition

Capitalized Contract Cost, Increase From Capitalization Of Costs

+ References

No definition available.

+ Details

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Namespace Prefix:	tenb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Capitalized Contract Cost [Roll Forward]

+ References

No definition available.

+ Details

Name:	tenb_CapitalizedContractCostRollForward
Namespace Prefix:	tenb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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Balance Type:	debit
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X

- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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