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Restructuring - Schedule of Components of Restructuring Expenses Including in Condensed Consolidated Statements of (Loss) Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Restructuring Cost And Reserve [Line Items]      
Total restructuring expenses $ 2 $ 301 $ 411
Cost of Revenue [Member]      
Restructuring Cost And Reserve [Line Items]      
Total restructuring expenses 0 15  
Selling, General and Administrative Expenses [Member]      
Restructuring Cost And Reserve [Line Items]      
Total restructuring expenses 2 142  
Research and Development Expenses [Member]      
Restructuring Cost And Reserve [Line Items]      
Total restructuring expenses 0 144  
Network Solutions [Member] | Cost of Revenue [Member]      
Restructuring Cost And Reserve [Line Items]      
Total restructuring expenses 0 12  
Services & Support [Member] | Cost of Revenue [Member]      
Restructuring Cost And Reserve [Line Items]      
Total restructuring expenses $ 0 $ 3