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Leases - Components of Lease Expense included in Condensed Consolidated Statement of Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lessor Lease Description [Line Items]
Total operating lease expense	$ 654	$ 1,215	$ 1,975	$ 2,830
Selling, General and Administrative Expenses [Member]
Lessor Lease Description [Line Items]
Total operating lease expense	265	352	863	1,050
Research and Development Expenses [Member]
Lessor Lease Description [Line Items]
Total operating lease expense	368	847	1,044	1,731
Cost of Sales [Member]
Lessor Lease Description [Line Items]
Total operating lease expense	$ 21	$ 16	$ 68	$ 49