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Leases - Components of Lease Expense included in Condensed Consolidated Statement of Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lessor Lease Description [Line Items]
Total operating lease expense	$ 548	$ 796	$ 1,321	$ 1,615
Selling, General and Administrative Expenses [Member]
Lessor Lease Description [Line Items]
Total operating lease expense	271	349	598	698
Research and Development Expenses [Member]
Lessor Lease Description [Line Items]
Total operating lease expense	251	430	676	884
Cost of Sales [Member]
Lessor Lease Description [Line Items]
Total operating lease expense	$ 26	$ 17	$ 47	$ 33