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Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	$ 6,046	$ 3,660	$ 17,135	$ 10,844
Inventory
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	295		295
Research and Development
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	2,332	1,973	7,194	5,707
Selling, General and Administrative
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	2,976	$ 1,687	8,561	$ 5,137
Cost of Sales - Product
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Stock-based compensation expense	$ 443		$ 1,085

X

- Definition

Allocated share based compensation capitalized.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
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-SubTopic 10
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- Definition

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.

+ References

No definition available.

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