Revenue Recognition - Activity of Deferred Contract Costs (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Capitalized Contract Cost [Roll Forward]
Beginning balance	$ 72,265	$ 59,434
Capitalization of contract acquisition costs	6,121	6,626
Amortization of deferred contract acquisition costs	(7,644)	(6,249)
Ending balance	$ 70,742	$ 59,811

Capitalized Contract Cost, Increase From Capitalization Of Costs

No definition available.

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Period Type:	duration

- Definition

Capitalized Contract Cost [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	tenb_
Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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://www.xbrl.org/2003/role/disclosureRef
-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

+ Details

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Period Type:	instant