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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill, relates to acquisition	$ 7,100,000	$ 3,500,000
Impairment losses on goodwil	0	0	$ 0
Amortization expense	2,300,000	2,900,000	$ 2,500,000
Network Solutions [Member]
Goodwill [Line Items]
Goodwill, relates to acquisition	6,700,000	3,100,000
Services & Support [Member]
Goodwill [Line Items]
Goodwill, relates to acquisition	$ 400,000	$ 400,000

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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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

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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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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No definition available.

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