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Leases - Components of Lease Expense included in Condensed Consolidated Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lessor Lease Description [Line Items]    
Total operating lease expense $ 1,215 $ 2,830
Selling, General and Administrative Expenses [Member]    
Lessor Lease Description [Line Items]    
Total operating lease expense 352 1,050
Research and Development Expenses [Member]    
Lessor Lease Description [Line Items]    
Total operating lease expense 847 1,731
Stock-based Compensation Expense Included in Cost of Sales [Member]    
Lessor Lease Description [Line Items]    
Total operating lease expense $ 16 $ 49