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Goodwill - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |
Goodwill, relates to acquisition |  | $ 7.0 | $ 7.1
SmartRG Inc [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, relates to acquisition |  | 3.5 |
Goodwill, reduced amount relates to acquisition |  | 0.1 |
Network Solutions [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, relates to acquisition | $ 6.6 | 6.6 | 6.7
Services & Support [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, relates to acquisition | $ 0.4 | $ 0.4 | $ 0.4

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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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. + References No definition available. + Details
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- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Details
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- Details
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- Details
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