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Restructuring - Schedule of Components of Restructuring Expense Included in Consolidated Statements of Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]      
Total restructuring expenses $ 411 $ 6,229 $ 6,014
Selling, General and Administrative Expenses [Member]      
Restructuring Cost And Reserve [Line Items]      
Total restructuring expenses 221 1,832 2,360
Research and Development Expenses [Member]      
Restructuring Cost And Reserve [Line Items]      
Total restructuring expenses 174 3,942 2,869
Cost of Sales [Member]      
Restructuring Cost And Reserve [Line Items]      
Total restructuring expenses 16 455 785
Cost of Sales [Member] | Network Solutions [Member]      
Restructuring Cost And Reserve [Line Items]      
Total restructuring expenses 13 220 629
Cost of Sales [Member] | Services And Support [Member]      
Restructuring Cost And Reserve [Line Items]      
Total restructuring expenses $ 3 $ 235 $ 156