XML 100 R90.htm IDEA: XBRL DOCUMENT v3.21.2
Restructuring - Schedule of Components of Restructuring Expenses Including in Condensed Consolidated Statements of Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses $ 1,903 $ 309 $ 3,648 $ 6,229
Cost of Revenue [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses 232 15 288  
Selling, General and Administrative Expenses [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses 1,050 145 1,622  
Research and Development Expenses [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses 621 149 1,738  
Network Solutions [Member] | Cost of Revenue [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses 187 12 220  
Services & Support [Member] | Cost of Revenue [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses $ 45 $ 3 $ 68