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Segment Information and Major Customers - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) Segment Category Customer	Dec. 31, 2020 USD ($) Customer	Dec. 31, 2019 USD ($) Customer
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	2
Depreciation expense	$ 12,000	$ 12,200	$ 12,500
Number of categories | Category	3
Number of single customer comprising more than 10% of sales | Customer	1	3	3
Long-lived assets	$ 55,800	$ 62,400
Network Solutions [Member]
Segment Reporting Information [Line Items]
Depreciation expense	1,200	1,400	$ 1,700
Services & Support [Member]
Segment Reporting Information [Line Items]
Depreciation expense	14	32	$ 29
U.S. [Member]
Segment Reporting Information [Line Items]
Long-lived assets	53,000	58,400
Outside U.S. [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 2,800	$ 4,000
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer 1 [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	18.00%	15.00%	19.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer 2 [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage		12.00%	17.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer 3 [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage		10.00%	13.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | The Five Largest Customers Other Than Those With More Than 10% Of Revenues and Excluding Distributors [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	38.00%	34.00%	28.00%

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