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Leases - Components of Lease Expense included in Consolidated Statement of Income (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Lessor Lease Description [Line Items]  
Total operating lease expense $ 3,881
Research and Development Expenses [Member]  
Lessor Lease Description [Line Items]  
Total operating lease expense 2,417
Selling, General and Administrative Expenses [Member]  
Lessor Lease Description [Line Items]  
Total operating lease expense 1,400
Cost of Sales [Member]  
Lessor Lease Description [Line Items]  
Total operating lease expense $ 64