Revenue Recognition - Additional Information (Detail)	6 Months Ended
Jun. 30, 2018 USD ($) Category
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Number of service contracts categories \| Category	2
Impairment losses related to deferred contract costs	$ 0
Revenue expected to be recognized from remaining performance obligations	$ 54,600,000
Percentage of revenue expected to be recognized from remaining performance obligations	57.00%
Period over revenue expected to be recognized from remaining performance obligations	12 months
Revenue remaining performance obligation expected timing of satisfaction explanation	We expect to recognize revenue on approximately 57% of these remaining performance obligations over the next 12 months,
Revenue adjustment as a result of changes in transaction price that relate to performance obligations satisfied	$ 0
Long Term [Member] \| Minimum [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Subscription contract period	1 year
Long Term [Member] \| Maximum [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Subscription contract period	3 years
Short Term [Member] \| Minimum [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Subscription contract period	3 months
Short Term [Member] \| Maximum [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Subscription contract period	12 months

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Revenue remaining performance obligation expected to be recognized as percentage.

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- Definition

Amount of impairment loss 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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- Definition

Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12A
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL108322424-203045

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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.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

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- Definition

Description of when remaining performance obligation is expected to be recognized as revenue.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

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- Definition

Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

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