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Leases - Components of Lease Expense included in Condensed Consolidated Statement of Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Lessor Lease Description [Line Items]    
Total operating lease expense $ 773 $ 819
Selling, General and Administrative Expenses [Member]    
Lessor Lease Description [Line Items]    
Total operating lease expense 327 349
Research and Development Expenses [Member]    
Lessor Lease Description [Line Items]    
Total operating lease expense 425 454
Cost of Sales [Member]    
Lessor Lease Description [Line Items]    
Total operating lease expense $ 21 $ 16