Inventory - Schedule of Inventory Valuation Adjustments Included in Cost of Sales (Detail) - Inventory Valuation and Obsolescence [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Inventory [Line Items]
Inventory valuation adjustments	$ 13,443	$ 201	$ 36,116	$ 726
Raw Materials [Member]
Inventory [Line Items]
Inventory valuation adjustments	173		384
Work In Process [Member]
Inventory [Line Items]
Inventory valuation adjustments	11,164	$ 201	30,656	$ 726
Finished Goods [Member]
Inventory [Line Items]
Inventory valuation adjustments	$ 2,106		$ 5,076