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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, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]          
Total restructuring expenses $ 1,903 $ 1,195 $ 3,648 $ 4,658 $ 6,014
Selling, General and Administrative Expenses [Member]          
Restructuring Cost And Reserve [Line Items]          
Total restructuring expenses 1,050 531 1,622 2,078  
Research and Development Expenses [Member]          
Restructuring Cost And Reserve [Line Items]          
Total restructuring expenses 621 602 1,738 1,833  
Cost of Sales [Member]          
Restructuring Cost And Reserve [Line Items]          
Total restructuring expenses $ 232 $ 62 $ 288 $ 747