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Equity Plans and Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Employees and directors stock-based compensation expense	$ 13,484	$ 25,456	$ 23,478
Inventory
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	2,280	1,964	759
Research and Development
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	1,000	8,058	9,604
Selling, General and Administrative
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	9,585	10,224	11,761
Cost of Sales - Product
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	$ 619	1,088	$ 1,354
Restructuring
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense		$ 4,122

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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