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Leases - Components of Lease Expense included in Condensed Consolidated Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Lessor Lease Description [Line Items]    
Total operating lease expense $ 796 $ 1,615
Selling, General and Administrative Expenses [Member]    
Lessor Lease Description [Line Items]    
Total operating lease expense 349 698
Research and Development Expenses [Member]    
Lessor Lease Description [Line Items]    
Total operating lease expense 430 884
Cost of Sales [Member]    
Lessor Lease Description [Line Items]    
Total operating lease expense $ 17 $ 33