Segment Information - Revenue and Gross Profit of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenue	$ 127,533	$ 114,523
Gross Profit	53,601	51,600
Network Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	113,809	97,372
Gross Profit	48,808	45,746
Services & Support [Member]
Segment Reporting Information [Line Items]
Revenue	13,724	17,151
Gross Profit	$ 4,793	$ 5,854

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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