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Revenue - Additional Information (Detail) | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($)
Revenue [Line Items] |
Period of assurance-based warranty for product defects | 90 days to five years
Remaining performance obligations | $ 0
Revenue recognized that was included in unearned revenue | $ 3,500,000
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 Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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