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Revenue - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenue [Line Items]
Period of assurance-based warranty for product defects			90 days to five years
Remaining performance obligations	$ 0		$ 0
Revenue recognized that was included in unearned revenue					$ 8,900,000
Lease Agreements [Member]
Revenue [Line Items]
Recognized revenue	$ 4,200,000	$ 8,400,000	$ 10,500,000	$ 15,400,000
Minimum [Member]
Revenue [Line Items]
Lessor sales type lease arrangement terms for network equipments			18 months
Maintenance service periods			1 month
Maximum [Member]
Revenue [Line Items]
Lessor sales type lease arrangement terms for network equipments			5 years
Maintenance service periods			5 years

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- Definition

Lessor sales type lease arrangement terms for network equipment.

+ References

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- Definition

Maintenance service periods.

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Revenue.

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
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- Definition

Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

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- Definition

Describes the nature of the product warranty, including the approximate term of the product warranty, how the product warranty arose, and the events or circumstances that would require the warrantor to perform under the product warranty.

+ References

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-Publisher FASB
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-Topic 460
-SubTopic 10
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