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Segment Information and Major Customers - Additional Information (Detail) $ in Thousands | 12 Months Ended
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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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