Summary of Significant Accounting Policies - Schedule of Inventory Valuation Adjustments Included in Cost of Sales (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Inventory Valuation Adjustments [Member]
Inventory [Line Items]
Inventory valuation adjustment no longer disclosed separately from cost of sales	$ 68,583	$ 4,561

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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