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Equity Plans and Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	$ 4,088	$ 9,349	$ 5,866	$ 15,519
Research and Development
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	774	1,976	(799)	4,156
Selling, General and Administrative
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	2,491	2,470	4,933	5,550
Restructuring
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense		4,122		4,122
Cost of Sales - Product
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	179	292	315	630
Inventory
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	$ 644	$ 489	$ 1,417	$ 1,061

X

- Definition

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

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