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Revenue - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue [Line Items]
Period of assurance-based warranty for product defects	90 days to five years
Recognized revenue		$ 9,900,000
Remaining performance obligations	$ 0
Lease Agreements [Member]
Revenue [Line Items]
Recognized revenue	$ 13,700,000	$ 16,500,000	$ 2,700,000
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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Lessor sales type lease arrangement terms for network equipment.

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

+ 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 (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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
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